I have done a lot of searching and found some similar issues, but I can't quite figure this out. I am using an Arduino Uno to control some stepper motors, and the controller works fine when plugged into my laptop with a USB cable, but when externally powered with a 5V adapter using the same USB cab…

Analog Pin Voltage With External Power Supply

groundFungus May 31, 2019, 7:55am 2

How is the 5V adapter connected to the Arduino?

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