Hey.
I am using sparkfun mp3 trigger with arduino mega.
I have connected the pins rx and tx.
I have also connected the gnd and vcc from trigger to arduino.
My question: can I only connect rx and tx to arduino and not gnd and vcc, but instead plug power to the trigger or should I also connect the gnd here?
Even if you connect separate power to the mp3 trigger vcc, you still need to connect the mp3 trigger gnd to the Arduino gnd
Also, connecting the trigger board to the Arduino RX/TX pins (0,1) may interfere with uploading to the Arduino and/or trigger board operation. It's best to use softwareserial with different RX/TX pins.
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