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?

LarryD October 24, 2017, 3:17am 6

6 is a little low try 9V or see what happens when you use USB for power?

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