{"id":10253,"date":"2023-06-08T20:24:14","date_gmt":"2023-06-08T18:24:14","guid":{"rendered":"https:\/\/deepbluembedded.com\/?p=10253"},"modified":"2023-08-17T23:49:43","modified_gmt":"2023-08-17T20:49:43","slug":"i2c-communication-between-two-arduino","status":"publish","type":"post","link":"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/","title":{"rendered":"I2C Communication Between Two Arduino Boards"},"content":{"rendered":"\n<p class=\"has-text-align-justify\">In this project, we&#8217;ll do an <strong>I2C Communication Between Two Arduino Boards<\/strong>. We&#8217;ll also discuss some Arduino I2C communication basics and fundamentals as a quick review of what we&#8217;ve previously learned in more detail in this previous <a href=\"https:\/\/deepbluembedded.com\/arduino-uart-example-tutorial\/\" target=\"_blank\" rel=\"noreferrer noopener\">Arduino I2C Tutorial<\/a>. We&#8217;ll discuss all 3 possible I2C communication scenarios and create 3 different I2C communication Arduino projects to cover them all.<\/p>\n\n\n\n<ul>\n<li>I2C Master Transmitter -&gt; Slave Receiver<\/li>\n\n\n\n<li>I2C Master Receiver &lt;- Slave Transmitter<\/li>\n\n\n\n<li>I2C Master TxRx &lt;-&gt; Slave RxTx<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-align-justify\">We&#8217;ll run the I2C communication between two Arduino boards projects in both the simulation environment and in real life to check how it behaves. Without further ado, let&#8217;s get right into it!<\/p>\n\n\n<h2 class=\"simpletoc-title\">Table of Contents<\/h2>\n<ol class=\"simpletoc-list\">\n<li><a href=\"#i2c-communication-between-two-arduino-boards\">I2C Communication Between Two Arduino Boards<\/a>\n\n<\/li>\n<li><a href=\"#two-arduino-i2c-communication-master-tx-slave-rx\">Two Arduino I2C Communication (Master Tx Slave Rx)<\/a>\n\n\n<\/li>\n\n<\/li>\n\n<\/li>\n\n<\/li>\n\n<\/li>\n\n<\/li>\n\n<\/li>\n\n<li><a href=\"#two-arduino-i2c-communication-master-rx-slave-tx\">Two Arduino I2C Communication (Master Rx Slave Tx)<\/a>\n\n\n<\/li>\n\n<\/li>\n\n<\/li>\n\n<\/li>\n\n<\/li>\n\n<\/li>\n\n<\/li>\n\n<li><a href=\"#two-arduino-i2c-communication-master-txrx-slave-rxtx\">Two Arduino I2C Communication (Master TxRx Slave RxTx)<\/a>\n\n\n<\/li>\n\n<\/li>\n\n<\/li>\n\n<\/li>\n\n<\/li>\n\n<li><a href=\"#wrap-up\">Wrap Up<\/a>\n<\/li><\/ol>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<h2 class=\"gb-headline gb-headline-3adb62d1 gb-headline-text\" id=\"i2c-communication-between-two-arduino-boards\"><strong>I2C Communication Between Two Arduino Boards<\/strong><\/h2>\n\n\n<p class=\"has-text-align-justify\">An I2C device (Master or Slave) can be a transmitter or a receiver and it\u2019s up to you, the system designer &amp; programmer, to decide whether a specific I2C device on the bus (Master or Slave) will be a data transmitter or receiver.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">Given that we\u2019re only considering Two Arduino boards (I2C devices), then it\u2019s a one-to-one communication. In other words, the Two Arduino boards will form a Single-Master Single-Slave I2C bus.<\/p>\n\n\n\n<p>Therefore, the I2C communication between the two Arduino boards can take one of the following forms:<\/p>\n\n\n\n<ol>\n<li><strong>Master (Tx) \u2192 Slave (Rx)<\/strong><\/li>\n\n\n\n<li><strong>Master (Rx) \u2190 Slave (Tx)<\/strong><\/li>\n\n\n\n<li><strong>Master (TxRx) \u2194\ufe0e Slave (RxTx)<\/strong><\/li>\n<\/ol>\n\n\n\n<p class=\"has-text-align-justify\">Which depends on your target application and what you\u2019re trying to achieve. This will be the basis on which you\u2019ll choose the most suitable form of communication between the two Arduino boards (I2C devices).<\/p>\n\n\n\n<p class=\"has-text-align-justify\">Next, we&#8217;ll implement each of the 3 possible forms of I2C communication between the two Arduino boards that we&#8217;ve mentioned above. I&#8217;ll give you a brief use case for each form of communication to help you make a guided design decision when you&#8217;re choosing the configuration that suits the needs of your next projects in the future.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">You need to refer to the tutorial below to help you understand the basics of Arduino I2C communication and how to use the Wire.h library functions. It&#8217;s a prerequisite for this tutorial so you can smoothly proceed with the example projects we&#8217;ll implement hereafter.<\/p>\n\n\n<div class=\"gb-container gb-container-1df72c92\"><div class=\"gb-inside-container\">\n<div class=\"gb-headline gb-headline-435a73d9 gb-headline-text\">????  Also Read<\/div>\n\n<div class=\"gb-grid-wrapper gb-grid-wrapper-3cdbb831\">\n<div class=\"gb-grid-column gb-grid-column-2b0fa73b\"><div class=\"gb-container gb-container-2b0fa73b\"><div class=\"gb-inside-container\">\n\n<figure class=\"gb-block-image gb-block-image-11f3baab\"><a href=\"https:\/\/deepbluembedded.com\/arduino-i2c-tutorial-examples\/\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"169\" class=\"gb-image gb-image-11f3baab\" src=\"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/Arduino-I2C-Communication-Tutorial-Wire-Library-300x169.jpg\" alt=\"Arduino I2C Communication Tutorial (Wire Library)\" title=\"Arduino I2C Communication Tutorial (Wire Library)\" srcset=\"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/Arduino-I2C-Communication-Tutorial-Wire-Library-300x169.jpg 300w, https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/Arduino-I2C-Communication-Tutorial-Wire-Library-1024x576.jpg 1024w, https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/Arduino-I2C-Communication-Tutorial-Wire-Library-768x432.jpg 768w, https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/Arduino-I2C-Communication-Tutorial-Wire-Library.jpg 1280w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n\n<\/div><\/div><\/div>\n\n<div class=\"gb-grid-column gb-grid-column-78c87ba0\"><div class=\"gb-container gb-container-78c87ba0\"><div class=\"gb-inside-container\">\n<div class=\"gb-headline gb-headline-9b24380c gb-headline-text\"><a href=\"https:\/\/deepbluembedded.com\/arduino-i2c-tutorial-examples\/\">Arduino I2C Tutorial<\/a><\/div>\n\n\n<p class=\"has-text-align-justify\">This is the ultimate guide for Arduino I2C communication. It\u2019ll give you an in-depth explanation of Arduino I2C fundamentals, wire library functions, Arduino I2C device programming, and a handful of Arduino I2C communication example projects.<\/p>\n\n<\/div><\/div><\/div>\n<\/div>\n<\/div><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<h2 class=\"gb-headline gb-headline-486ec781 gb-headline-text\" id=\"two-arduino-i2c-communication-master-tx-slave-rx\"><strong><strong>Two Arduino I2C Communication (Master Tx Slave Rx)<\/strong><\/strong><\/h2>\n\n\n<p class=\"has-text-align-justify\">In this example project, we&#8217;ll establish serial communication between two Arduino Boards using I2C communication (TWI). One Arduino board will act as an I2C master transmitter that will read a potentiometer analog input and send it to the I2C Slave Arduino board. <\/p>\n\n\n\n<p class=\"has-text-align-justify\">The other Arduino board will act as an I2C slave receiver that will read the incoming data from the master device and use it to control a PWM output (LED). This is a one-way communication between (<strong>Arduino I2C Master Transmitter<\/strong>) <strong>-&gt;<\/strong> (<strong>Arduino I2C Slave Receiver<\/strong>).<\/p>\n\n\n<h4 class=\"gb-headline gb-headline-316a3e37 gb-headline-text\" id=\"use-case-scenario\">Use Case (Scenario)<\/h4>\n\n\n<p class=\"has-text-align-justify\">This I2C communication configuration can be really helpful in many situations. When your Arduino board uses most of its IO pins for driving outputs (Motors, LEDs, or whatever. Then, it&#8217;d be a good idea to have another board that takes the user inputs (buttons, potentiometers, joysticks, etc) and send the readings to the outputs driver Arduino board.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">In this configuration, the I2C slave receiver device needs some information from the master transmitter which reads the user inputs and sends them to the I2C slave receiver device.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">For instance, let&#8217;s pretend that our Arduino board did run out of ADC (analog input) channels and we need to hook up a potentiometer to accept user input to control the brightness of an output LED (PWM-controlled). We can of course use an analog switch (multiplexer) or external ADC to solve the problem but let&#8217;s solve it by I2C communication with another Arduino board.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">The solution to this situation is to set the Arduino board that needs extra ADC inputs as an I2C slave receiver and connect another Arduino board on the I2C bus that acts as a master transmitter which will do the potentiometer (analog input) reading and send the results to the other Arduino board (the slave receiver).<\/p>\n\n\n\n<p>And this is what we&#8217;re going to do in this example project!<\/p>\n\n\n<h4 class=\"gb-headline gb-headline-664d0fe8 gb-headline-text\" id=\"wiring\">Wiring<\/h4>\n\n\n<p>Here is the wiring diagram for this example showing how to connect the LED output, and the potentiometer analog input on both Arduino boards (I2C Master Tx &amp; I2C Slave Rx).<\/p>\n\n\n\n<figure class=\"gb-block-image gb-block-image-b23f0b52\"><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"556\" class=\"gb-image gb-image-b23f0b52\" src=\"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example1.jpg\" alt=\"I2C-Communication-Between-Two-Arduino-Boards-Example1\" title=\"I2C-Communication-Between-Two-Arduino-Boards-Example1\" srcset=\"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example1.jpg 1280w, https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example1-300x130.jpg 300w, https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example1-1024x445.jpg 1024w, https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example1-768x334.jpg 768w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n<h4 class=\"gb-headline gb-headline-51a6f4a7 gb-headline-text\" id=\"arduino-i2c-master-tx-board-code\">Arduino I2C Master Tx Board Code<\/h4>\n\n\n<p>Here is the complete code listing for the Arduino I2C Master Transmitter Board.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\/*\n * LAB Name: Arduino I2C Master(Tx)\n * Author: Khaled Magdy\n * For More Info Visit: www.DeepBlueMbedded.com\n*\/\n#include &lt;Wire.h&gt;\n\nint AN_POT;\n\nvoid setup() {\n  Wire.begin(); \/\/ Initialize I2C (Master Mode: address is optional)\n}\n\nvoid loop() {\n  AN_POT = analogRead(A0);\n  Wire.beginTransmission(0x55); \/\/ Transmit to device with address 85 (0x55)\n  Wire.write((AN_POT&gt;&gt;2));      \/\/ Sends Potentiometer Reading (8Bit)\n  Wire.endTransmission();       \/\/ Stop transmitting\n  delay(100);\n}<\/pre>\n\n\n\n<p><\/p>\n\n\n<h4 class=\"gb-headline gb-headline-0f602b16 gb-headline-text\" id=\"arduino-i2c-slave-rx-board-code\">Arduino I2C Slave Rx Board Code<\/h4>\n\n\n<p>Here is the complete code listing for the Arduino I2C Slave Receiver Board.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\/*\n * LAB Name: Arduino I2C Slave(Rx)\n * Author: Khaled Magdy\n * For More Info Visit: www.DeepBlueMbedded.com\n*\/\n#include &lt;Wire.h&gt;\n\n#define LED_PIN 9\n\nbyte RxByte;\n\nvoid I2C_RxHandler(int numBytes)\n{\n  while(Wire.available()) {  \/\/ Read Any Received Data\n    RxByte = Wire.read();\n  }\n}\n\nvoid setup() {\n  pinMode(LED_PIN, OUTPUT);\n  Wire.begin(0x55); \/\/ Initialize I2C (Slave Mode: address=0x55 )\n  Wire.onReceive(I2C_RxHandler);\n}\n\nvoid loop() {\n  analogWrite(LED_PIN, RxByte);\n  delay(100);\n}<\/pre>\n\n\n\n<p><\/p>\n\n\n<h4 class=\"gb-headline gb-headline-d2337544 gb-headline-text\" id=\"master-code-explanation\">Master Code Explanation<\/h4>\n\n\n<p class=\"has-text-align-justify\">First of all, we need to include the Arduino&nbsp;<code>Wire.h<\/code>&nbsp;library to use the I2C communication module, and define a variable to hold the analog potentiometer reading (10-Bit ADC result).<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">#include &lt;Wire.h&gt;\n\nint AN_POT;<\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>setup()<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-justify\">in the <code>setup()<\/code> function, we&#8217;ll initialize the I2C module in master mode (no address is needed).<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Wire.begin(); \/\/ Initialize I2C (Master Mode: address is optional)<\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>loop()<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-justify\">in the <code>loop()<\/code> function, we&#8217;ll read the analog potentiometer value and scale it down to 8-Bit range (1 byte) and send it over I2C to the slave device @ address = 0x55, and finally terminate the I2C transaction. This process will repeat 10  times per second, hence the use of delay(100ms).<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">AN_POT = analogRead(A0);\nWire.beginTransmission(0x55); \/\/ Transmit to device with address 85 (0x55)\nWire.write((AN_POT&gt;&gt;2));      \/\/ Sends Potentiometer Reading (8Bit)\nWire.endTransmission();       \/\/ Stop transmitting\ndelay(100);<\/pre>\n\n\n\n<p><\/p>\n\n\n<h4 class=\"gb-headline gb-headline-3b796cfb gb-headline-text\" id=\"slave-code-explanation\">Slave Code Explanation<\/h4>\n\n\n<p class=\"has-text-align-justify\">First of all, we need to include the Arduino&nbsp;<code>Wire.h<\/code>&nbsp;library to use the I2C communication module, define the output PWM pin for the LED, and define a variable to save the received data (byte) from the master Arduino board.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">#include &lt;Wire.h&gt;\n\n#define LED_PIN 9\n\nbyte RxByte;<\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>I2C_RxHandler()<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-justify\">This is the I2C receive event handler function which is automatically called whenever the device receives data over the I2C bus. In which, we&#8217;ll read the incoming data byte and store it in a global variable. This will thereafter be used by the main function to set the PWM output duty cycle.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">void I2C_RxHandler(int numBytes)\n{\n  while(Wire.available()) {  \/\/ Read Any Received Data\n    RxByte = Wire.read();\n  }\n}<\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>setup()<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-justify\">in the <code>setup()<\/code> function, we&#8217;ll initialize the LED output pin mode, and initialize the I2C module in slave mode with (<code>address=85 or 0x55<\/code>). We&#8217;ll also assign the event handler function to the I2C onReceive event.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">pinMode(LED_PIN, OUTPUT);\nWire.begin(0x55); \/\/ Initialize I2C (Slave Mode: address=0x55 )\nWire.onReceive(I2C_RxHandler);<\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>loop()<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-justify\">in the <code>loop()<\/code> function, we&#8217;ll apply the received duty cycle value to the PWM LED output.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">analogWrite(LED_PIN, RxByte);<\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p>And that&#8217;s it!<\/p>\n\n\n\n<p class=\"has-text-align-justify\">We can test this project&#8217;s code example using any available Arduino simulator environment. Here I&#8217;ll show you the simulation results for this project on TinkerCAD.<\/p>\n\n\n<h4 class=\"gb-headline gb-headline-c48fc017 gb-headline-text wp-embed-aspect-16-9 wp-has-aspect-ratio\" id=\"tinkercad-simulation\">TinkerCAD Simulation<\/h4>\n\n\n<p class=\"wp-embed-aspect-16-9 wp-has-aspect-ratio\">Here is the simulation result for this project on the TinkerCAD simulator. You can run it as is, or make a copy and add your own code and start running the simulation to see how it&#8217;s going to behave.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"I2C Communication Between Two Arduino Boards Example1\" width=\"1200\" height=\"675\" src=\"https:\/\/www.youtube.com\/embed\/jBZyfEPrW7Y?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-text-align-left\"><strong>You can check this <a href=\"https:\/\/www.tinkercad.com\/things\/9oCy5bRpvG2?sharecode=nFcHt11sKvvzKGY7ScuyBdMEp_-BUx1k9ff7dkKypw8\" target=\"_blank\" rel=\"noreferrer noopener\">simulation project on TinkerCAD using this link<\/a>.<\/strong><\/p>\n\n\n<h4 class=\"gb-headline gb-headline-1587f804 gb-headline-text\" id=\"testing-results\">Testing Results<\/h4>\n\n\n<p class=\"has-text-align-justify wp-embed-aspect-16-9 wp-has-aspect-ratio\">Here is a demo video for testing this project on my two Arduino UNO boards.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/youtu.be\/SF49NJnXpp4\n<\/div><\/figure>\n\n\n\n<p class=\"wp-embed-aspect-16-9 wp-has-aspect-ratio\"><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<h2 class=\"gb-headline gb-headline-03fb9874 gb-headline-text\" id=\"two-arduino-i2c-communication-master-rx-slave-tx\"><strong><strong>Two Arduino I2C Communication (Master Rx Slave Tx)<\/strong><\/strong><\/h2>\n\n\n<p class=\"has-text-align-justify\">In this example project, we&#8217;ll establish serial communication between two Arduino Boards using I2C communication (TWI). One Arduino board will act as an I2C slave transmitter that will read 4-DIP switched (digital input) and send it to the I2C Master receiver Arduino board. <\/p>\n\n\n\n<p class=\"has-text-align-justify\">The other Arduino board will act as an I2C Master receiver that will read the incoming data from the slave device and use it to control some output LEDs. This is a one-way communication between (<strong>Arduino I2C Master Receiver<\/strong>) <strong>&lt;-<\/strong> (<strong>Arduino I2C Slave Transmitter<\/strong>).<\/p>\n\n\n<h4 class=\"gb-headline gb-headline-41863f4c gb-headline-text\" id=\"use-case-scenario\">Use Case (Scenario)<\/h4>\n\n\n<p class=\"has-text-align-justify\">This I2C communication configuration can be really helpful in many situations. When your Arduino board uses most of its IO pins for driving outputs (Motors, LEDs, or whatever. Then, it&#8217;d be a good idea to have another board that takes the user inputs (buttons, potentiometers, joysticks, etc) and send the readings to the outputs driver Arduino board.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">In this configuration, the I2C master receiver device needs some information from the slave transmitter which reads the user inputs and sends them to the I2C master receiver device.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">For instance, let&#8217;s pretend that our Arduino board did run out of digital IO pins and we need to hook up 4 DIP switches input to control 4 LEDs On\/Off. We can of course use a multiplexer or IO expander to solve the problem but let&#8217;s solve it by I2C communication with another Arduino board that has spare IO pins.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">The solution to this situation is to set the Arduino board that needs extra digital input pins as an I2C master receiver and connect another Arduino board on the I2C bus that acts as a slave transmitter which will do the digital inputs reading and send the results to the other Arduino board (the master receiver).<\/p>\n\n\n\n<p>And this is what we&#8217;re going to do in this example project!<\/p>\n\n\n<h4 class=\"gb-headline gb-headline-d70f9382 gb-headline-text\" id=\"wiring\">Wiring<\/h4>\n\n\n<p>Here is the wiring diagram for this example showing how to connect the output LEDs, and the 4-DIP switches input on both Arduino boards (I2C Master Rx &amp; I2C Slave Tx).<\/p>\n\n\n\n<figure class=\"gb-block-image gb-block-image-278fbe73\"><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"591\" class=\"gb-image gb-image-278fbe73\" src=\"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example2.jpg\" alt=\"I2C-Communication-Between-Two-Arduino-Boards-Example2\" title=\"I2C-Communication-Between-Two-Arduino-Boards-Example2\" srcset=\"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example2.jpg 1280w, https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example2-300x139.jpg 300w, https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example2-1024x473.jpg 1024w, https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example2-768x355.jpg 768w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n<h4 class=\"gb-headline gb-headline-6a538d87 gb-headline-text\" id=\"arduino-i2c-master-rx-board-code\">Arduino I2C Master Rx Board Code<\/h4>\n\n\n<p>Here is the complete code listing for the Arduino I2C Master Receiver Board.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\/*\n * LAB Name: Arduino I2C Master(Rx)\n * Author: Khaled Magdy\n * For More Info Visit: www.DeepBlueMbedded.com\n*\/\n#include &lt;Wire.h&gt;\n\n#define LED0_PIN 4\n#define LED1_PIN 5\n#define LED2_PIN 6\n#define LED3_PIN 7\n\nbyte RxByte;\n\nvoid setup() {\n  Wire.begin(); \/\/ Initialize I2C (Master Mode: address is optional)\n  pinMode(LED0_PIN, OUTPUT);\n  pinMode(LED1_PIN, OUTPUT);\n  pinMode(LED2_PIN, OUTPUT);\n  pinMode(LED3_PIN, OUTPUT);\n}\n\nvoid loop() {\n  Wire.requestFrom(0x55, 1); \/\/ Request From Slave @ 0x55, Data Length = 1Byte\n  while(Wire.available()) {  \/\/ Read Received Datat From Slave Device\n    RxByte = Wire.read();\n  }\n  digitalWrite(LED0_PIN, (RxByte&amp;0x01));\n  digitalWrite(LED1_PIN, (RxByte&amp;0x02));\n  digitalWrite(LED2_PIN, (RxByte&amp;0x04));\n  digitalWrite(LED3_PIN, (RxByte&amp;0x08));\n  delay(100);\n}<\/pre>\n\n\n\n<p><\/p>\n\n\n<h4 class=\"gb-headline gb-headline-015f3946 gb-headline-text\" id=\"arduino-i2c-slave-tx-board-code\">Arduino I2C Slave Tx Board Code<\/h4>\n\n\n<p>Here is the complete code listing for the Arduino I2C Slave Transmitter Board.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\/*\n * LAB Name: Arduino I2C Slave(Tx)\n * Author: Khaled Magdy\n * For More Info Visit: www.DeepBlueMbedded.com\n*\/\n#include &lt;Wire.h&gt;\n\n#define BTN0_PIN 4\n#define BTN1_PIN 5\n#define BTN2_PIN 6\n#define BTN3_PIN 7\n\nbyte TxByte = 0;\n\nvoid I2C_TxHandler(void)\n{\n  Wire.write(TxByte);\n}\n\nvoid setup() {\n  pinMode(BTN0_PIN, INPUT_PULLUP);\n  pinMode(BTN1_PIN, INPUT_PULLUP);\n  pinMode(BTN2_PIN, INPUT_PULLUP);\n  pinMode(BTN3_PIN, INPUT_PULLUP);\n  Wire.begin(0x55); \/\/ Initialize I2C (Slave Mode: address=0x55 )\n  Wire.onRequest(I2C_TxHandler);\n}\n\nvoid loop() {\n  byte BtnsData = 0;\n  BtnsData |= digitalRead(BTN0_PIN) &lt;&lt; 0;\n  BtnsData |= digitalRead(BTN1_PIN) &lt;&lt; 1;\n  BtnsData |= digitalRead(BTN2_PIN) &lt;&lt; 2;\n  BtnsData |= digitalRead(BTN3_PIN) &lt;&lt; 3;\n  TxByte = BtnsData;\n  delay(10);\n}<\/pre>\n\n\n\n<p><\/p>\n\n\n<h4 class=\"gb-headline gb-headline-7d91f9d1 gb-headline-text\" id=\"master-code-explanation\">Master Code Explanation<\/h4>\n\n\n<p class=\"has-text-align-justify\">First of all, we need to include the Arduino&nbsp;<code>Wire.h<\/code>&nbsp;library to use the I2C communication module, define the IO pins for output LEDs, and define a variable to hold the received byte from the I2C slave device that holds the 4-DIP switches states.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">#include &lt;Wire.h&gt;\n\n#define LED0_PIN 4\n#define LED1_PIN 5\n#define LED2_PIN 6\n#define LED3_PIN 7\n\nbyte RxByte;<\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>setup()<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-justify\">in the <code>setup()<\/code> function, we&#8217;ll initialize the I2C module in master mode (no address is needed), and we&#8217;ll initialize the IO pins used for LEDs as output pins.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Wire.begin(); \/\/ Initialize I2C (Master Mode: address is optional)\npinMode(LED0_PIN, OUTPUT);\npinMode(LED1_PIN, OUTPUT);\npinMode(LED2_PIN, OUTPUT);\npinMode(LED3_PIN, OUTPUT);<\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>loop()<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-justify\">in the <code>loop()<\/code> function, we&#8217;ll request the 4-DIP switches&#8217; states from the I2C slave device @ the address 0x55. As an I2C master device, we&#8217;ll initiate the I2C transaction with the slave device by doing this. After getting the response, we&#8217;ll store it in the global <code>RxByte<\/code> variable.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Wire.requestFrom(0x55, 1); \/\/ Request From Slave @ 0x55, Data Length = 1Byte\n  while(Wire.available()) {  \/\/ Read Received Datat From Slave Device\n    RxByte = Wire.read();\n}<\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p>Next, we&#8217;ll parse out the individual bits inside the received byte that represents the 4-DIP switches states and control the output LEDs accordingly.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">digitalWrite(LED0_PIN, (RxByte&amp;0x01));\ndigitalWrite(LED1_PIN, (RxByte&amp;0x02));\ndigitalWrite(LED2_PIN, (RxByte&amp;0x04));\ndigitalWrite(LED3_PIN, (RxByte&amp;0x08));<\/pre>\n\n\n\n<p><\/p>\n\n\n<h4 class=\"gb-headline gb-headline-7a8c9e0b gb-headline-text\" id=\"slave-code-explanation\">Slave Code Explanation<\/h4>\n\n\n<p class=\"has-text-align-justify\">First of all, we need to include the Arduino&nbsp;<code>Wire.h<\/code>&nbsp;library to use the I2C communication module, define the digital input pins for the DIP switches, and define a variable to send the switches&#8217; state data (byte) to the master Arduino board.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">#include &lt;Wire.h&gt;\n\n#define BTN0_PIN 4\n#define BTN1_PIN 5\n#define BTN2_PIN 6\n#define BTN3_PIN 7\n\nbyte TxByte = 0;<\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>I2C_TxHandler()<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-justify\">This is the I2C transmit event handler function which is automatically called whenever the device receives a data request from an I2C master device over the I2C bus. In which, we&#8217;ll send out the DIP switches&#8217; states (<code>TxByte<\/code>) variable.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">void I2C_TxHandler(void)\n{\n  Wire.write(TxByte);\n}<\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>setup()<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-justify\">in the <code>setup()<\/code> function, we&#8217;ll initialize the digital input pins, and initialize the I2C module in slave mode with (<code>address=85 or 0x55<\/code>). We&#8217;ll also assign the event handler function to the I2C onRequest event.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">pinMode(BTN0_PIN, INPUT_PULLUP);\npinMode(BTN1_PIN, INPUT_PULLUP);\npinMode(BTN2_PIN, INPUT_PULLUP);\npinMode(BTN3_PIN, INPUT_PULLUP);\nWire.begin(0x55); \/\/ Initialize I2C (Slave Mode: address=0x55 )\nWire.onRequest(I2C_TxHandler);<\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>loop()<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-justify\">in the <code>loop()<\/code> function, we&#8217;ll read the digital input pins (DIP switches&#8217; states) and save them into the <code>TxByte<\/code> global variable which will be sent to the master I2C Arduino board whenever it requests it.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">byte BtnsData = 0;\nBtnsData |= digitalRead(BTN0_PIN) &lt;&lt; 0;\nBtnsData |= digitalRead(BTN1_PIN) &lt;&lt; 1;\nBtnsData |= digitalRead(BTN2_PIN) &lt;&lt; 2;\nBtnsData |= digitalRead(BTN3_PIN) &lt;&lt; 3;\nTxByte = BtnsData;<\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p>And that&#8217;s it!<\/p>\n\n\n\n<p class=\"has-text-align-justify\">We can test this project&#8217;s code example using any available Arduino simulator environment. Here I&#8217;ll show you the simulation results for this project on TinkerCAD.<\/p>\n\n\n<h4 class=\"gb-headline gb-headline-70621c00 gb-headline-text wp-embed-aspect-16-9 wp-has-aspect-ratio\" id=\"tinkercad-simulation\">TinkerCAD Simulation<\/h4>\n\n\n<p class=\"wp-embed-aspect-16-9 wp-has-aspect-ratio\">Here is the simulation result for this project on the TinkerCAD simulator. You can run it as is, or make a copy and add your own code and start running the simulation to see how it&#8217;s going to behave.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"I2C Communication Between Two Arduino Boards Example2\" width=\"1200\" height=\"675\" src=\"https:\/\/www.youtube.com\/embed\/4Ml6cp1kFmw?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-text-align-left\"><strong>You can check this <a href=\"https:\/\/www.tinkercad.com\/things\/5wcRmsmfgqd?sharecode=f-cED8hh9aNh6J3HH7Qio1vw4sn5Qa0FJQbDDeCECSI\" target=\"_blank\" rel=\"noreferrer noopener\">simulation project on TinkerCAD using this link<\/a>.<\/strong><\/p>\n\n\n<h4 class=\"gb-headline gb-headline-16c517f0 gb-headline-text\" id=\"testing-results\">Testing Results<\/h4>\n\n\n<p class=\"has-text-align-justify wp-embed-aspect-16-9 wp-has-aspect-ratio\">Here is a demo video for testing this project on my two Arduino UNO boards.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Arduino I2C Master Rx Slave Tx Example Demo\" width=\"1200\" height=\"675\" src=\"https:\/\/www.youtube.com\/embed\/UsnPovdkQRI?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p class=\"wp-embed-aspect-16-9 wp-has-aspect-ratio\"><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<h2 class=\"gb-headline gb-headline-67a9f7fb gb-headline-text\" id=\"two-arduino-i2c-communication-master-txrx-slave-rxtx\"><strong><strong>Two Arduino I2C Communication (Master TxRx Slave RxTx)<\/strong><\/strong><\/h2>\n\n\n<p class=\"has-text-align-justify\">In this example project, we&#8217;ll establish serial communication between two Arduino Boards using I2C communication (TWI). One Arduino board will act as an I2C Master transmitter\/receiver device, while the other will act as an I2C Slave receiver\/transmitter device.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">This is going to be two-way communication between (<strong>Arduino I2C Master TxRx<\/strong>) <strong>&lt;-&gt;<\/strong> (<strong>Arduino I2C Slave RxTx<\/strong>). Which is the ultimate I2C data exchange example between two Arduino boards.<\/p>\n\n\n<h4 class=\"gb-headline gb-headline-fa87b0ce gb-headline-text\" id=\"use-case-scenario\">Use Case (Scenario)<\/h4>\n\n\n<p class=\"has-text-align-justify\">This I2C communication configuration can be really helpful in many situations. When your Arduino board needs information from another board (like sensor reading, user input, or whatever) while that other board does also need some information from the first board. Therefore, the need for communication arises.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">We&#8217;ll combine both previous examples we&#8217;ve done so far to create this two-way communication project, where the two I2C devices (Arduino Boards) will act as follows:<\/p>\n\n\n\n<ul>\n<li><strong>I2C Master Board<\/strong>: Will <strong>Transmit<\/strong> the reading of analog input (Potentiometer) and request from the slave device to <strong>Receive<\/strong> the reading of 4-DIP switches to control the output 4 LEDs.<\/li>\n\n\n\n<li><strong>I2C Slave Board<\/strong>: Will <strong>Receive<\/strong> the analog potentiometer reading from the master device, and respond to the data request by <strong>Transmitting<\/strong> the digital states of the 4-DIP input switches.<\/li>\n<\/ul>\n\n\n\n<p>And this is how both Arduino boards will do I2C data exchange transactions in this project!<\/p>\n\n\n<h4 class=\"gb-headline gb-headline-aba95326 gb-headline-text\" id=\"wiring\">Wiring<\/h4>\n\n\n<p>Here is the wiring diagram for this example showing how to connect the output LEDs, DIP switches, and potentiometer on both Arduino boards (I2C Master TxRx &amp; I2C Slave RxTx).<\/p>\n\n\n\n<figure class=\"gb-block-image gb-block-image-892744e9\"><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"713\" class=\"gb-image gb-image-892744e9\" src=\"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example3.jpg\" alt=\"I2C-Communication-Between-Two-Arduino-Boards-Example3\" title=\"I2C-Communication-Between-Two-Arduino-Boards-Example3\" srcset=\"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example3.jpg 1280w, https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example3-300x167.jpg 300w, https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example3-1024x570.jpg 1024w, https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example3-768x428.jpg 768w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n<h4 class=\"gb-headline gb-headline-6b7e3333 gb-headline-text\" id=\"arduino-i2c-master-txrx-board-code\">Arduino I2C Master TxRx Board Code<\/h4>\n\n\n<p>Here is the complete code listing for the Arduino I2C Master Transmitter-Receiver Board.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\/*\n * LAB Name: Arduino I2C Master(TxRx)\n * Author: Khaled Magdy\n * For More Info Visit: www.DeepBlueMbedded.com\n*\/\n#include &lt;Wire.h&gt;\n\n#define LED0_PIN 4\n#define LED1_PIN 5\n#define LED2_PIN 6\n#define LED3_PIN 7\n\nint AN_POT;\nbyte RxByte;\n\nvoid setup() {\n  Wire.begin(); \/\/ Initialize I2C (Master Mode: address is optional)\n  pinMode(LED0_PIN, OUTPUT);\n  pinMode(LED1_PIN, OUTPUT);\n  pinMode(LED2_PIN, OUTPUT);\n  pinMode(LED3_PIN, OUTPUT);\n}\n\nvoid loop() {\n  \/\/ I2C TX\n  AN_POT = analogRead(A0);\n  Wire.beginTransmission(0x55); \/\/ Transmit to device with address 85 (0x55)\n  Wire.write((AN_POT&gt;&gt;2));      \/\/ Sends Potentiometer Reading (8Bit)\n  Wire.endTransmission();       \/\/ Stop transmitting\n  \/\/ I2C RX\n  Wire.requestFrom(0x55, 1); \/\/ Request From Slave @ 0x55, Data Length = 1Byte\n  while(Wire.available()) {  \/\/ Read Received Datat From Slave Device\n    RxByte = Wire.read();\n  }\n  digitalWrite(LED0_PIN, (RxByte&amp;0x01));\n  digitalWrite(LED1_PIN, (RxByte&amp;0x02));\n  digitalWrite(LED2_PIN, (RxByte&amp;0x04));\n  digitalWrite(LED3_PIN, (RxByte&amp;0x08));\n  \n  delay(100);\n}<\/pre>\n\n\n\n<p><\/p>\n\n\n<h4 class=\"gb-headline gb-headline-dec2caf2 gb-headline-text\" id=\"arduino-i2c-slave-rxtx-board-code\">Arduino I2C Slave RxTx Board Code<\/h4>\n\n\n<p>Here is the complete code listing for the Arduino I2C Slave Receiver-Transmitter Board.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\/*\n * LAB Name: Arduino I2C Slave(RxTx)\n * Author: Khaled Magdy\n * For More Info Visit: www.DeepBlueMbedded.com\n*\/\n#include &lt;Wire.h&gt;\n\n#define LED_PIN 9\n#define BTN0_PIN 4\n#define BTN1_PIN 5\n#define BTN2_PIN 6\n#define BTN3_PIN 7\n\nbyte RxByte;\nbyte TxByte = 0;\n\nvoid I2C_RxHandler(int numBytes)\n{\n  while(Wire.available()) {  \/\/ Read Any Received Data\n    RxByte = Wire.read();\n  }\n}\n\nvoid I2C_TxHandler(void)\n{\n  Wire.write(TxByte);\n}\n\nvoid setup() {\n  pinMode(LED_PIN, OUTPUT);\n  pinMode(BTN0_PIN, INPUT_PULLUP);\n  pinMode(BTN1_PIN, INPUT_PULLUP);\n  pinMode(BTN2_PIN, INPUT_PULLUP);\n  pinMode(BTN3_PIN, INPUT_PULLUP);\n  Wire.begin(0x55); \/\/ Initialize I2C (Slave Mode: address=0x55 )\n  Wire.onReceive(I2C_RxHandler);\n  Wire.onRequest(I2C_TxHandler);\n}\n\nvoid loop() {\n  byte BtnsData = 0;\n  BtnsData |= digitalRead(BTN0_PIN) &lt;&lt; 0;\n  BtnsData |= digitalRead(BTN1_PIN) &lt;&lt; 1;\n  BtnsData |= digitalRead(BTN2_PIN) &lt;&lt; 2;\n  BtnsData |= digitalRead(BTN3_PIN) &lt;&lt; 3;\n  TxByte = BtnsData;\n  analogWrite(LED_PIN, RxByte);\n  delay(10);\n}<\/pre>\n\n\n\n<p><\/p>\n\n\n<div class=\"gb-container gb-container-30d92673\"><div class=\"gb-inside-container\">\n<div class=\"gb-headline gb-headline-b04bb8fe gb-headline-text\">\u2755  Note<\/div>\n\n\n<p class=\"has-text-align-justify\">Note That the I2C Master board&#8217;s code is a superset of both example1 &amp; example2 masters&#8217; codes. And the same goes for the I2C Slave board&#8217;s code as well. It combines the logic implemented in the first and in the second examples together. So both devices can do a two-way I2C communication.<\/p>\n\n<\/div><\/div>\n\n\n<p class=\"has-text-align-justify\">We can test this project&#8217;s code example using any available Arduino simulator environment. Here I&#8217;ll show you the simulation results for this project on TinkerCAD.<\/p>\n\n\n<h4 class=\"gb-headline gb-headline-407ef3a9 gb-headline-text wp-embed-aspect-16-9 wp-has-aspect-ratio\" id=\"tinkercad-simulation\">TinkerCAD Simulation<\/h4>\n\n\n<p class=\"wp-embed-aspect-16-9 wp-has-aspect-ratio\">Here is the simulation result for this project on the TinkerCAD simulator. You can run it as is, or make a copy and add your own code and start running the simulation to see how it&#8217;s going to behave.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"I2C Communication Between Two Arduino Boards Example3\" width=\"1200\" height=\"675\" src=\"https:\/\/www.youtube.com\/embed\/tHTSoc50-BE?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-text-align-left\"><strong>You can check this <a href=\"https:\/\/www.tinkercad.com\/things\/dNOeEqF5DZS?sharecode=g_ECK_23zTrs8nWJEMkpJTbVA4WHgTd_vKWmbJxM1lE\" target=\"_blank\" rel=\"noreferrer noopener\">simulation project on TinkerCAD using this link<\/a>.<\/strong><\/p>\n\n\n<h4 class=\"gb-headline gb-headline-6dd09717 gb-headline-text\" id=\"testing-results\">Testing Results<\/h4>\n\n\n<p class=\"has-text-align-justify wp-embed-aspect-16-9 wp-has-aspect-ratio\">Here is a demo video for testing this project on my two Arduino UNO boards.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Arduino I2C Master TxRx Slave RxTx Example Demo\" width=\"1200\" height=\"675\" src=\"https:\/\/www.youtube.com\/embed\/1JxFZa0bIq0?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p class=\"wp-embed-aspect-16-9 wp-has-aspect-ratio\"><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<div class=\"gb-container gb-container-4ee53656\"><div class=\"gb-inside-container\">\n\n<p class=\"gb-headline gb-headline-2701efd7 gb-headline-text\"><strong>Parts List<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-justify\">Here is the full components list for all parts that you&#8217;d need in order to perform the practical LABs mentioned here in this article and for the whole Arduino Programming series of tutorials found here on DeepBlueMbedded. Please, note that those are affiliate links and we&#8217;ll receive a small commission on your purchase at no additional cost to you, and it&#8217;d definitely support our work.<\/p>\n\n\n<div class=\"gb-button-wrapper gb-button-wrapper-7cf4dd75\">\n\n<a class=\"gb-button gb-button-47f15bc4 gb-button-text\" href=\"https:\/\/www.amazon.com\/shop\/deepbluembedded\/list\/1HTCD77Q43SNG?ref_=cm_sw_r_cp_ud_aipsflist_aipsfdeepbluembedded_GJ0DQ9YAJBQFPDHHB7PM\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">Arduino Course Kit List<\/a>\n\n<\/div>\n<\/div><\/div>\n\n<div class=\"gb-container gb-container-4ee53656\"><div class=\"gb-inside-container\">\n<p class=\"gb-headline gb-headline-2701efd7 gb-headline-text\"><strong>Download Attachments<\/strong><\/p>\n\n\n<p style=\"text-align: justify;\">You can download all attachment files for this Article\/Tutorial (project files, schematics, code, etc..) using the link below. Please consider supporting my work through the various support options listed in the link down below. Every small donation helps to keep this website up and running and ultimately supports our community.<\/p>\n\n\n<div class=\"gb-grid-wrapper gb-grid-wrapper-2155b8e3\">\n<div class=\"gb-grid-column gb-grid-column-13e0597a\"><div class=\"gb-container gb-container-13e0597a\"><div class=\"gb-inside-container\">\n<div class=\"gb-button-wrapper gb-button-wrapper-7cf4dd75\">\n\n<a class=\"gb-button gb-button-47f15bc4 gb-button-text\" href=\"https:\/\/drive.google.com\/file\/d\/1PKNYLlbOxLlSkW2BmH_f1hdcVTnapYKc\/view?usp=sharing\" target=\"_blank\" rel=\"noopener noreferrer\">DOWNLOAD<\/a>\n\n<\/div>\n<\/div><\/div><\/div>\n\n<div class=\"gb-grid-column gb-grid-column-37f853aa\"><div class=\"gb-container gb-container-37f853aa\"><div class=\"gb-inside-container\">\n<div class=\"gb-button-wrapper gb-button-wrapper-c15cbd3e\">\n\n<a class=\"gb-button gb-button-2b1899ec gb-button-text\" href=\"https:\/\/deepbluembedded.com\/support-me\/\" target=\"_blank\" rel=\"noopener noreferrer\">DONATE HERE<\/a>\n\n<\/div>\n<\/div><\/div><\/div>\n<\/div>\n\n\n<hr class=\"wp-block-separator aligncenter has-text-color has-contrast-color has-alpha-channel-opacity has-contrast-background-color has-background is-style-default\"\/>\n\n<\/div><\/div>\n\n<h2 class=\"gb-headline gb-headline-dc00790f gb-headline-text\" id=\"wrap-up\"><strong>Wrap Up<\/strong><\/h2>\n\n\n<p class=\"has-text-align-justify\">To conclude this project, we&#8217;d like to highlight the fact that I2C serial communication is very flexible and allows multi-master multi-slave devices on the bus. Another upside is that it can run flawlessly even if you kept adding more devices to the two-wire bus, unlike other serial communication ports that are more restricted in this sense.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">This tutorial is part of our&nbsp;<strong><a href=\"https:\/\/deepbluembedded.com\/arduino-tutorials\/\">Arduino Series of Tutorials<\/a><\/strong>&nbsp;that you should definitely check out and keep in your bookmarks in case you need to search for something or ask for help. I&#8217;ll gladly do my best to help you solve whatever issue you&#8217;re up against.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">If you&#8217;re just starting with Arduino, check out the <a href=\"https:\/\/deepbluembedded.com\/arduino-getting-started-beginners-guide\/\"><strong>Arduino Getting Started [Ultimate Guide]<\/strong><\/a> here.<\/p>\n\n\n<div class=\"gb-container gb-container-a1430c1b\"><div class=\"gb-inside-container\">\n<div class=\"gb-headline gb-headline-a45c156e gb-headline-text\">????  Also Read<\/div>\n\n<div class=\"gb-grid-wrapper gb-grid-wrapper-3580cf1a\">\n<div class=\"gb-grid-column gb-grid-column-15b652cb\"><div class=\"gb-container gb-container-15b652cb\"><div class=\"gb-inside-container\">\n\n<figure class=\"gb-block-image gb-block-image-0aac91f6\"><a href=\"https:\/\/deepbluembedded.com\/arduino-getting-started-beginners-guide\/\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"169\" class=\"gb-image gb-image-0aac91f6\" src=\"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/04\/Getting-Started-With-Arduino-Programming-For-Beginners-300x169.jpg\" alt=\"Getting Started With Arduino Programming For Beginners\" title=\"Getting Started With Arduino Programming For Beginners\" srcset=\"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/04\/Getting-Started-With-Arduino-Programming-For-Beginners-300x169.jpg 300w, https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/04\/Getting-Started-With-Arduino-Programming-For-Beginners-1024x576.jpg 1024w, https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/04\/Getting-Started-With-Arduino-Programming-For-Beginners-768x432.jpg 768w, https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/04\/Getting-Started-With-Arduino-Programming-For-Beginners.jpg 1280w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n\n<\/div><\/div><\/div>\n\n<div class=\"gb-grid-column gb-grid-column-6c9320c6\"><div class=\"gb-container gb-container-6c9320c6\"><div class=\"gb-inside-container\">\n<div class=\"gb-headline gb-headline-66698b40 gb-headline-text\"><a href=\"https:\/\/deepbluembedded.com\/arduino-getting-started-beginners-guide\/\"><\/a><a href=\"https:\/\/deepbluembedded.com\/arduino-getting-started-beginners-guide\/\">Getting Started With Arduino [Ultimate Guide]<\/a><\/div>\n\n\n<p class=\"has-text-align-justify\">This is the ultimate guide for getting started with Arduino for beginners. It\u2019ll help you learn the Arduino fundamentals for Hardware &amp; Software and understand the basics required to accelerate your learning journey with Arduino Programming.<\/p>\n\n<\/div><\/div><\/div>\n<\/div>\n<\/div><\/div>\n\n<div class=\"gb-container gb-container-90b0cf40\"><div class=\"gb-inside-container\">\n<div class=\"gb-headline gb-headline-8204431a gb-headline-text\">????  Also Read<\/div>\n\n<div class=\"gb-grid-wrapper gb-grid-wrapper-f537a359\">\n<div class=\"gb-grid-column gb-grid-column-0f8c327c\"><div class=\"gb-container gb-container-0f8c327c\"><div class=\"gb-inside-container\">\n\n<figure class=\"gb-block-image gb-block-image-1578b7a4\"><a href=\"https:\/\/deepbluembedded.com\/arduino-serial-communication\/\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"169\" class=\"gb-image gb-image-1578b7a4\" src=\"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/05\/Arduino-Serial-Communication-Tutorial-300x169.jpg\" alt=\"Arduino Serial Communication Tutorial\" title=\"Arduino Serial Communication Tutorial\" srcset=\"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/05\/Arduino-Serial-Communication-Tutorial-300x169.jpg 300w, https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/05\/Arduino-Serial-Communication-Tutorial-1024x576.jpg 1024w, https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/05\/Arduino-Serial-Communication-Tutorial-768x432.jpg 768w, https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/05\/Arduino-Serial-Communication-Tutorial.jpg 1280w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n\n<\/div><\/div><\/div>\n\n<div class=\"gb-grid-column gb-grid-column-1ca9f1c9\"><div class=\"gb-container gb-container-1ca9f1c9\"><div class=\"gb-inside-container\">\n<div class=\"gb-headline gb-headline-b3994c76 gb-headline-text\"><a href=\"https:\/\/deepbluembedded.com\/arduino-serial-communication\/\">Arduino Serial Communication Tutorial<\/a><\/div>\n\n\n<p class=\"has-text-align-justify\">This article will give more in-depth information about Arduino serial communication fundamentals and a general overview of Arduino&#8217;s UART, SPI, and I2C serial communication ports (protocol).<\/p>\n\n<\/div><\/div><\/div>\n<\/div>\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p> &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"I2C Communication Between Two Arduino Boards\" class=\"read-more button\" href=\"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/#more-10253\" aria-label=\"Read more about I2C Communication Between Two Arduino Boards\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":10279,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[275,85,28],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>I2C Communication Between Two Arduino Boards<\/title>\n<meta name=\"description\" content=\"I2C Communication Between Two Arduino Boards Example. Two Arduino I2C Communication. Arduino I2C Slave Set Up (Receiver - Transmitter)\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"I2C Communication Between Two Arduino Boards\" \/>\n<meta property=\"og:description\" content=\"I2C Communication Between Two Arduino Boards Example. Two Arduino I2C Communication. Arduino I2C Slave Set Up (Receiver - Transmitter)\" \/>\n<meta property=\"og:url\" content=\"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/\" \/>\n<meta property=\"og:site_name\" content=\"DeepBlue\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/khaled.elrawy.359\/\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/khaled.elrawy.359\/\" \/>\n<meta property=\"article:published_time\" content=\"2023-06-08T18:24:14+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-08-17T20:49:43+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example-Projects.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Khaled Magdy\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Khaled Magdy\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"16 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/\"},\"author\":{\"name\":\"Khaled Magdy\",\"@id\":\"https:\/\/deepbluembedded.com\/#\/schema\/person\/30259d66cf68c6c681562dbe551b7867\"},\"headline\":\"I2C Communication Between Two Arduino Boards\",\"datePublished\":\"2023-06-08T18:24:14+00:00\",\"dateModified\":\"2023-08-17T20:49:43+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/\"},\"wordCount\":2806,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/deepbluembedded.com\/#\/schema\/person\/30259d66cf68c6c681562dbe551b7867\"},\"image\":{\"@id\":\"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example-Projects.jpg\",\"articleSection\":[\"Arduino Projects\",\"Embedded Projects\",\"Embedded Systems\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/\",\"url\":\"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/\",\"name\":\"I2C Communication Between Two Arduino Boards\",\"isPartOf\":{\"@id\":\"https:\/\/deepbluembedded.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example-Projects.jpg\",\"datePublished\":\"2023-06-08T18:24:14+00:00\",\"dateModified\":\"2023-08-17T20:49:43+00:00\",\"description\":\"I2C Communication Between Two Arduino Boards Example. Two Arduino I2C Communication. Arduino I2C Slave Set Up (Receiver - Transmitter)\",\"breadcrumb\":{\"@id\":\"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/#primaryimage\",\"url\":\"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example-Projects.jpg\",\"contentUrl\":\"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example-Projects.jpg\",\"width\":1280,\"height\":720,\"caption\":\"I2C Communication Between Two Arduino Boards Example Projects\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/deepbluembedded.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"I2C Communication Between Two Arduino Boards\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/deepbluembedded.com\/#website\",\"url\":\"https:\/\/deepbluembedded.com\/\",\"name\":\"DeepBlueMbedded\",\"description\":\"Embedded Systems And Computer Engineering Tutorials &amp; Articles\",\"publisher\":{\"@id\":\"https:\/\/deepbluembedded.com\/#\/schema\/person\/30259d66cf68c6c681562dbe551b7867\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/deepbluembedded.com\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":[\"Person\",\"Organization\"],\"@id\":\"https:\/\/deepbluembedded.com\/#\/schema\/person\/30259d66cf68c6c681562dbe551b7867\",\"name\":\"Khaled Magdy\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/deepbluembedded.com\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/ed20e191de77104a5b091d9bc5821c4a?s=96&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/ed20e191de77104a5b091d9bc5821c4a?s=96&r=g\",\"caption\":\"Khaled Magdy\"},\"logo\":{\"@id\":\"https:\/\/deepbluembedded.com\/#\/schema\/person\/image\/\"},\"description\":\"Principal Embedded Systems Engineer with years of experience in embedded software and hardware design. I work in the Automotive &amp; e-Mobility industry. However, I still do Hardware design and SW development for DSP, Control Systems, Robotics, AI\/ML, and other fields I'm passionate about. I love reading, writing, creating projects, and teaching. A reader by day and a writer by night, it's my lifestyle. I believe that the combination of brilliant minds, bold ideas, and a complete disregard for what is possible, can and will change the world! I will be there when it happens, will you?\",\"sameAs\":[\"https:\/\/deepbluembedded.com\",\"https:\/\/www.facebook.com\/khaled.elrawy.359\/\",\"https:\/\/www.instagram.com\/deepbluembedded\/\",\"https:\/\/www.linkedin.com\/in\/khaled-magdy-\/\",\"https:\/\/www.youtube.com\/channel\/UCzLSrNZD4rCjSCOVU9hknvA\"]}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"I2C Communication Between Two Arduino Boards","description":"I2C Communication Between Two Arduino Boards Example. Two Arduino I2C Communication. Arduino I2C Slave Set Up (Receiver - Transmitter)","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/","og_locale":"en_US","og_type":"article","og_title":"I2C Communication Between Two Arduino Boards","og_description":"I2C Communication Between Two Arduino Boards Example. Two Arduino I2C Communication. Arduino I2C Slave Set Up (Receiver - Transmitter)","og_url":"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/","og_site_name":"DeepBlue","article_publisher":"https:\/\/www.facebook.com\/khaled.elrawy.359\/","article_author":"https:\/\/www.facebook.com\/khaled.elrawy.359\/","article_published_time":"2023-06-08T18:24:14+00:00","article_modified_time":"2023-08-17T20:49:43+00:00","og_image":[{"width":1280,"height":720,"url":"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example-Projects.jpg","type":"image\/jpeg"}],"author":"Khaled Magdy","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Khaled Magdy","Est. reading time":"16 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/#article","isPartOf":{"@id":"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/"},"author":{"name":"Khaled Magdy","@id":"https:\/\/deepbluembedded.com\/#\/schema\/person\/30259d66cf68c6c681562dbe551b7867"},"headline":"I2C Communication Between Two Arduino Boards","datePublished":"2023-06-08T18:24:14+00:00","dateModified":"2023-08-17T20:49:43+00:00","mainEntityOfPage":{"@id":"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/"},"wordCount":2806,"commentCount":0,"publisher":{"@id":"https:\/\/deepbluembedded.com\/#\/schema\/person\/30259d66cf68c6c681562dbe551b7867"},"image":{"@id":"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/#primaryimage"},"thumbnailUrl":"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example-Projects.jpg","articleSection":["Arduino Projects","Embedded Projects","Embedded Systems"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/","url":"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/","name":"I2C Communication Between Two Arduino Boards","isPartOf":{"@id":"https:\/\/deepbluembedded.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/#primaryimage"},"image":{"@id":"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/#primaryimage"},"thumbnailUrl":"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example-Projects.jpg","datePublished":"2023-06-08T18:24:14+00:00","dateModified":"2023-08-17T20:49:43+00:00","description":"I2C Communication Between Two Arduino Boards Example. Two Arduino I2C Communication. Arduino I2C Slave Set Up (Receiver - Transmitter)","breadcrumb":{"@id":"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/#primaryimage","url":"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example-Projects.jpg","contentUrl":"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example-Projects.jpg","width":1280,"height":720,"caption":"I2C Communication Between Two Arduino Boards Example Projects"},{"@type":"BreadcrumbList","@id":"https:\/\/deepbluembedded.com\/i2c-communication-between-two-arduino\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/deepbluembedded.com\/"},{"@type":"ListItem","position":2,"name":"I2C Communication Between Two Arduino Boards"}]},{"@type":"WebSite","@id":"https:\/\/deepbluembedded.com\/#website","url":"https:\/\/deepbluembedded.com\/","name":"DeepBlueMbedded","description":"Embedded Systems And Computer Engineering Tutorials &amp; Articles","publisher":{"@id":"https:\/\/deepbluembedded.com\/#\/schema\/person\/30259d66cf68c6c681562dbe551b7867"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/deepbluembedded.com\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":["Person","Organization"],"@id":"https:\/\/deepbluembedded.com\/#\/schema\/person\/30259d66cf68c6c681562dbe551b7867","name":"Khaled Magdy","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/deepbluembedded.com\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/ed20e191de77104a5b091d9bc5821c4a?s=96&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/ed20e191de77104a5b091d9bc5821c4a?s=96&r=g","caption":"Khaled Magdy"},"logo":{"@id":"https:\/\/deepbluembedded.com\/#\/schema\/person\/image\/"},"description":"Principal Embedded Systems Engineer with years of experience in embedded software and hardware design. I work in the Automotive &amp; e-Mobility industry. However, I still do Hardware design and SW development for DSP, Control Systems, Robotics, AI\/ML, and other fields I'm passionate about. I love reading, writing, creating projects, and teaching. A reader by day and a writer by night, it's my lifestyle. I believe that the combination of brilliant minds, bold ideas, and a complete disregard for what is possible, can and will change the world! I will be there when it happens, will you?","sameAs":["https:\/\/deepbluembedded.com","https:\/\/www.facebook.com\/khaled.elrawy.359\/","https:\/\/www.instagram.com\/deepbluembedded\/","https:\/\/www.linkedin.com\/in\/khaled-magdy-\/","https:\/\/www.youtube.com\/channel\/UCzLSrNZD4rCjSCOVU9hknvA"]}]}},"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/deepbluembedded.com\/wp-content\/uploads\/2023\/06\/I2C-Communication-Between-Two-Arduino-Boards-Example-Projects.jpg","jetpack_shortlink":"https:\/\/wp.me\/p9SirL-2Fn","jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/deepbluembedded.com\/wp-json\/wp\/v2\/posts\/10253"}],"collection":[{"href":"https:\/\/deepbluembedded.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/deepbluembedded.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/deepbluembedded.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/deepbluembedded.com\/wp-json\/wp\/v2\/comments?post=10253"}],"version-history":[{"count":18,"href":"https:\/\/deepbluembedded.com\/wp-json\/wp\/v2\/posts\/10253\/revisions"}],"predecessor-version":[{"id":10280,"href":"https:\/\/deepbluembedded.com\/wp-json\/wp\/v2\/posts\/10253\/revisions\/10280"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/deepbluembedded.com\/wp-json\/wp\/v2\/media\/10279"}],"wp:attachment":[{"href":"https:\/\/deepbluembedded.com\/wp-json\/wp\/v2\/media?parent=10253"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/deepbluembedded.com\/wp-json\/wp\/v2\/categories?post=10253"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/deepbluembedded.com\/wp-json\/wp\/v2\/tags?post=10253"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}