I wired the two terminals of one battery to the Arduino power jack, but that caused false readings from the Arduino analog pin.
-10v instead of +2v
I'm powering the Arduino through its external power supply.If I connect the positive and negative lines of my power adapter to one battery, I get 12V, and can run the Arduino, but the voltage I read from the pot on the UNO is incorrect.If I connect the positive and negative lines of my power adapter to different batteries, then I have 24V at the power adapter.I did not run a ground to the UNO. Should have I?
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