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Topic: 5v out of the 3.3v Pin (Read 736 times) previous topic - next topic


I keep getting 5v out of my 3.3v Pin.
Just discovered it when I tried to run my temp sensor off 3.3v because its supposed to be less noisy.
Code and scaling didn't make any sense.

I tried powering my UNO with both the USB and a AC to DC converter and got the same result.

Any Ideas?


Short on or off the board?  The FTDI chip is damaged?
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]


"Short on or off the board?  The FTDI chip is damaged?"

Not sure how I would know this...


Doesn't Uno have separate onboard 3.3V regulator, there is no FTDI chip to create 3.3V?

While powered off: Use a multimeter and measure between the 3.3V pin and the 5V pin and see if they are shorted together.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

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