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1 vote

Arduino UNO pin 3V3 OUTPUT have 5V

I guess either the regulator has failed creating a short or the 5v rail is shorted to the 3v3 rail elsewhere. Removing the regulator and checking the 3v3 rail is no longer 5v should tell you. The only ...
1 vote

Arduino | external power supply and USB at the same time

Assuming your question is more along the lines of "How to prevent back driving a USB connected RPi through an externally powered Arduino". Consider cutting the positive power wire in the USB ...
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2 votes
Accepted

AA alkaline batteries on firebeetle?

The following is based purely on the small amount of information in your question. You haven't described your code or your setup, which would allow this answer to be more specific. According to the ...
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