Any pair of GPIO pins can be used, as long as they support the proper output/input modes. ESP32 lite variant chips (ESP32-S3, ESP32-C3, ESP32-S2, etc) may have fewer UARTs (usually two). Used for hardware sharing change accordingly. If you have configured the logger to use a different hardware UART, the pins If you configure a UART that overlaps with these pins, you can share the hardware with the UART0 is (by default) used by the logger component, using tx_pin: GPIO1 and When the hardware UARTs are all occupied, ESPHome will fall back to a software implementation that may not Whenever possible, ESPHome will use the hardware UART unit on the ESP8266 for fast and accurate communication. Id ( Optional, ID): Manually specify the ID for this UART hub if you need multiple UART hubs.ĭebug ( Optional, mapping): Options for debugging communication on the UART hub, see Debugging. Stop_bits ( Optional, int): The number of stop bits to send. Parity ( Optional): The parity used on the UART bus. Defaults to 256.ĭata_bits ( Optional, int): The number of data bits used on the UART bus. Increase if you use an integration that needs to read big payloads from UART. Rx_buffer_size ( Optional, int): The size of the buffer used for receiving UART messages. Use the full pin schema and set inverted: true to invert logic levels. Rx_pin ( Optional, Pin): The pin to receive data on from the ESP’s perspective. Tx_pin ( Optional, Pin): The pin to send data to from the ESP’s perspective. ![]() # Example configuration entry uart : tx_pin : 1 rx_pin : 3 baud_rate : 9600 Configuration variables: ¶īaud_rate ( Required, int): The baud rate of the UART bus. In some cases only TX or RX exists as the device at the other end only accepts data or sends data. Receive/send data at using the baud_rate option. Need to try with the two pins switched if it doesn’t work immediately.Īdditionally, each UART bus can operate at different speeds (baud rates), so ESPHome needs to know what speed to it sends on pin B and receives on pin A). Perspective these two pins are switched (i.e. While the ESP might send ( TX) on pin A and receive ( RX) data on pin B, from the other device’s Please note that the naming of these two pins depends on the chosen perspective and can be ambiguous. RX: This line is used to receive data from the device at the other end. ![]() TX: This line is used to send data to the device at the other end. ![]() UART (or for Arduino often also called Serial) usually You have probably used UART to access the chip. For example, when uploading a binary to your ESP UART is a common serial protocol for a lot of devices.
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