I have 2 Arduino Nano projects I would like to work together and I need advice on how and IF it can be done.
I have a game table where I have the whole thing powered by ONE PC power supply.
One 5v lead is powering one Arduino Nano running the scoreboard.
A different 5v lead is powering a SECOND Nano running the sounds.
I have ONE pos and Neg lead coming off the Scoreboard that supplies constant 5v at the end of a game
(the idea was to add a buzzer somewhere down the line)
I'd like that 5v lead (from scoreboard) to signal the second Arduino (sounds board) to play a track off of an DFPlayer mini acting as a switch.
The Question is, Because they are BOTH running off of the same PC power supply could I just hook the positive to a pin on the second Nano and neg to neg on that project?
OR should I use the same 5v lead that powers the First Project, to power the second, and have it hooked up the same way?
I'd ultimately would like the pin state to act as a switch on the sound Nano to play a track.