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MultiSerial Mega using Arduino -
Serial communication between two Arduino boards
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Bluetooth HC-05(06) module
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TX RX between Arduinos - Programming Questions - Arduino Forum
Brand new to arduino. How many pins are digital on the arduino mega 2560? I'm getting confused, the pins on the left side of the board can be used both as analog
Funny Electronics: Convert Digital Pins of Arduino Board to Transmitter (Tx) and Receiver (Rx)