I have a RPi2 with a touchscreen attached. All the supply pins are covered by the screen jumper. I'd like to set up a small thermistor circuit. My question is - can I use a standard GPIO pin set to high to provide 3.3v or would the current draw be too high?



  • Hopefully it's clear in what sense this is a duplicate. The (recommended) max output per pin (and in total) is documented there as well as various other places. Whether that is enough for what you want depends on the requirements of the thermistor circuit. – goldilocks Sep 12 '15 at 13:13
  • Thanks Goldilocks for helping. It was just the sort of direction I was looking for. If I could trouble you a bit further do you think it would be ok for learn.adafruit.com/thermistor/using-a-thermistor. I suspect yes but an second opinion would be great. – Davies-Barnard Sep 12 '15 at 14:04
  • I'm no electronics guru (and general electronics questions should go to our larger sibling site, Electrical Engineering), but I think applying a little Ohm's law should settle this; the current requirement in amps would be 3.3 / max circuit resistance. – goldilocks Sep 12 '15 at 14:09
  • Sounds like me teaching! Thanks. As long as it's that simple and I'm not missing anything I should be ok. – Davies-Barnard Sep 12 '15 at 14:14

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