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In some older boards, TX and RX pins are used for communication with the computer, which means connecting anything to these pins can interfere with that communication, including causing failed uploads to the board. UART is the communication protocol we use to communicate from the computer to the board through the USB cable. In the serial port context, the set baud rate will serve as the maximum number of bits per second to be transferred. The baud rate, is the rate at which information is transferred to a communication channel. These pins are dedicated for that specific purpose, either transmitting or receiving.Īsynchronous means there is no clock signal to synchronize the output bits from the transmitting device going to the receiving end, but the baud rate needs to be the same on both the transmitting and receiving devices. Among the available communication protocols, UART uses only two wires for its transmitting and receiving ends, TX (Transmitter) and RX (Receiver). The UART communication sends data bits one by one, from the least significant to the most significant, framed by start and stop bits so that precise timing is handled by the communication channel.Įmbedded systems, microcontrollers, and computers mostly use UART as a form of device-to-device hardware protocol. It allows an asynchronous serial communication in which the data format and transmission speed are configurable. UART (Universal Asynchronous Receiver-Transmitter) is one of the most used device-to-device communication protocols. 4 x Arduino Nano Every (or any other Arduino boards that works at 5V).
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