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In these cases, the ESP32 is the master chip and the external devices are the slaves. We use this protocol many times with the ESP32 to communicate with external devices like sensors and displays. multiple masters controlling the same slave: for example, two ESP32 boards writing data to the same I2C OLED display.multiple slaves to one master: for example, your ESP32 reads from a BME280 sensor using I2C and writes the sensor readings in an I2C OLED display.

I☬ means Inter Integrated Circuit (it’s pronounced I-squared-C), and it is a synchronous, multi-master, multi-slave communication protocol. Introducing ESP32 I2C Communication Protocol

Installing the ESP32 Board in Arduino IDE (Windows, Mac OS X, and Linux instructions).

Follow the next tutorial to install the ESP32 on the Arduino IDE, if you haven’t already. We’ll program the ESP32 using Arduino IDE, so before proceeding with this tutorial you should have the ESP32 add-on installed in your Arduino IDE.

Use Different I2C Pins with ESP32 (change default I2C pins).

In this tutorial, we’ll cover the following concepts:

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