Used to communicate using UART in Half Duplex mode. This library comes with two implementations: - hardHalfDuplexSerial use Arduino built-in UART. A direction pin should be set up to switch between transmit & receive mode. - softHalfDuplexSerial use only one pin of the Arduino Board. The receiver should obviously be grouded with the Arduino board (so at least 2 wires between the receiver and the Arduino) The pin should support change interrupts: - 0n the Mega and Mega 2560 only the following can be used for RX: 10, 11, 12, 13, 14, 15, 50, 51, 52, 53, A8 (62), A9 (63), A10 (64), A11 (65), A12 (66), A13 (67), A14 (68), A15 (69). - On the Leonardo and Micro only the following can be used for RX: 8, 9, 10, 11, 14 (MISO), 15 (SCK), 16 (MOSI).
If more than one soft serial port is used, halfDuplexSerial.listen() should be called on the port to be listened before receiving data.
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