Oct 2, 2019 · When using the ESP32 with Arduino IDE, the default I2C pins are GPIO 22 (SCL) and GPIO 21 (SDA) but you can configure your code to use any other pins. Recommended reading: ESP32 GPIO Reference Guide. With I2C communication, each slave on the bus has its own address, a hexadecimal number that allows the ESP32 to communicate with each device.

You can route the SDA and SCL pins of each I2C interface to any GPIO (which can be output and which is in the correct power domain). Please check the technical reference manual if you are interested in details.

Pull-ups must be connected to the SCL and SDA pins when this function is called. If you get ESP_ERR_TIMEOUT while xfer_timeout_ms was parsed correctly, you should check the pull-up resistors. If you do not have proper resistors nearby. flags.enable_internal_pullup` is …

The default I2C pin in ESP32 for SDA is GPIO21 and for SCL is GPIO22. If we want to change the GPIO pins we have to set them in code. The diagram below shows the pinout for the ESP32 which shows the default I2C pins.

The SDA and SCL pins are default assigned to the following pins. SDA - GPIO 8; SCL - GPIO 9; However, it is possible to use any GPIO pin to implement the I2C protocol using the command wire.begin(SDA, SCL). read more. SPI Pins of the ESP32-S3. The ESP32 has four interfaces SPI0, SPI1, SPI2, and SPI3.

The hardware I2C pins for the ESP32 are GPIO 22 (SCL) and GPIO 21 (SDA). The pins with a blue rectangle in the figure below. However, you can set almost any pin as I2C via software.

Sep 16, 2024 · There are two I 2 C interfaces in ESP32 with complete flexibility on assigning pins i.e., SCL and SDA pins for both I 2 C interfaces can be assigned in the program by the user. If you are using Arduino IDE, then the default I 2 C pins are: SDA – GPIO21; SCL – GPIO22; PWM

As an example, the Nano ESP32's SDA/SCL pins are attached to A4/A5 by default. These pins can be changed to e.g. D8,D9 if you need to use another set of pins. This is done through the mux / GPIO matrix.

Mar 30, 2024 · We’ll go through how ESP32 I2C works, how to alter the default I2C pins (SDA, SCL), how to connect numerous I2C devices on the bus with proper addressing, and how to make an ESP32 I2C scanner to check for available I2C devices on the bus and obtain their addresses.

Mar 12, 2024 · With the ESP32, you can utilize the dedicated I2C pins, namely the Serial Data Line (SDA) and the Serial Clock Line (SCL), to establish reliable and efficient communication. To provide you with a comprehensive visual reference, below is a detailed table that presents the communication pins of the ESP32: