The Wire.h library is used in Arduino IDE to communicate with I2C devices. Most of the GPIO pins of ESP32 can be set as I2C pins. If we want to change the default I2C pins we have to set them in code. Change ESP32 default I2C pins in Arduino IDEĪs we mentioned before, the default I2C pin in ESP32 for SDA is GPIO21 and for SCL is GPIO22. TCA9548A that will allow a maximum of eight devices with the same addresses to be connected to the same I2C bus. However, it is not that simple to change the address of a device and it only allows limited devices to be used on the same I2C bus. To use the same I2C devices with the ESP32 board, we would either have to change the I2C address of the device or use an I2C multiplexer. It is only applicable for short distance data transmission. Many Sensors use this serial communication protocol to transfer their data to microcontrollers or through this protocol different slave circuits are able to communication with master circuits. Like SPI, I2C is concurrent, the output of bits is synchronized to the testing of bits by a clock signal shared between the master and the slave. I2C bus supports multiple slave devices and multiple master devices.ĭata is transferred bit by bit serially along a wire (the SDA line). Devices that want to communicate with each connect through an I2C bus. It is a very popular communication protocol used in embedded projects to interface I2C based sensors, digit displays, and communication modules. Furthermore, it is a multi-master bus protocol that requires only two wires to transfer data serially which are SCL and SDA. It is an asynchronous half-duplex serial communication protocol. It is a 2-wire serial communication protocol for short-range data transfer applications. I2C is also known as an inter-integrated circuit or IIC or I square C.
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