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Author Topic: 5v out of the 3.3v Pin  (Read 356 times)
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Aluman000
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« on: April 26, 2011, 07:24:58 pm »
 Bigger Bigger Smaller Smaller Reset Reset
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?
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MarkT
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« Reply #1 on: April 27, 2011, 04:43:24 am »
 Bigger Bigger Smaller Smaller Reset Reset
Short on or off the board?  The FTDI chip is damaged?
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Aluman000
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« Reply #2 on: April 27, 2011, 06:02:06 am »
 Bigger Bigger Smaller Smaller Reset Reset
"Short on or off the board?  The FTDI chip is damaged?"

Not sure how I would know this...
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CrossRoads
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« Reply #3 on: April 27, 2011, 03:34:41 pm »
 Bigger Bigger Smaller Smaller Reset Reset
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.
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17

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