![]() ![]() Sometimes you need more serial ports than the number of hardware serial ports available. So if you connect UART device on pin 0 and pin D1, you have to remove them before downloading program through USB. It communicates on digital pins 0 (RX) and 1 (TX) as well as with the computer via USB. Most of arduino boards have at least one Serial, some have multiple serials(Arduino Mega has 4 Serials). ![]() The software uses the hardware to send bytes or bits that the connected hardware understands. The hardware provides the electrical signaling between Arduino and the device it is talking to. Implementing serial communications involves hardware and software. Serial communications provide an easy and flexible way for your Arduino board to interact with your computer and other devices.
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