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Which GND to use for sensors ?
Hi, the only GND i see on the A2 is the one also used for POWER IN

I want to connect a PIR , i can take the `3v3` from the board but i am not sure which GND to use . Should i use the same as the `INPUT power` ?

example diagram of what i want to do

Attached Files Image(s)
it's ok, just connect with power's GND.

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