This pin is used for serial UART communication with pc or other serial devices for purpose of data sharing and logging. It enables the Arduino to communicate with serial devices. UART stands for Universal Asynchronous Receiver and Transmitter. This allows us to have multiple SPI peripheral devices sharing the same MISO, MOSI, and CLK lines Which pins are UART ? When it’s value HIGH, it ignores the master. When a device’s Slave Select pin value is LOW, it can communicate with the master. This line is used for sending data to the peripherals.
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