Power Pins
•
GND - this is the common ground for all power and logic
•
BAT - this is the positive voltage to/from the JST jack for the optional Lipoly
battery
•
USB - this is the positive voltage to/from the micro USB jack if connected
•
EN - this is the 3.3V regulator's enable pin. It's pulled up, so connect to ground
to disable the 3.3V regulator
©Adafruit Industries
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