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I need to made device controlled with 3 Raspberry PI connected in cluster and want to made power supply via GPIO.
Do I need made 3V3 and 5V supply or just 5V on GPIO2?
Pins and GPIO are not the same thing.
You can not power the Pi via the GPIO.
You can power via certain pins on the expansion header.
Pin 2 and pin 4 are 5V pins.
You should only supply power via a 5V pin.
DO NOT try to provide power via the 3V3 pins or any GPIO.
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