I'm running using a 3.5V input (because I have to power the arduino from a battery) and for some reason my Arduino won't recognize the 3.5V it as a HIGH input. Really not sure what is wrong here. Any help?

Arduino minimum high threshold?

Wawa October 24, 2017, 3:31am 9

What are the resistor values.
Did you share Arduino ground and 12volt battery ground.
Leo..

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