I have an esp32 wroom 32 dev board. I'm running into power issues and I'm not sure what's going on.

When I try to upload sketches the uploads fail if I have any jumpers running to the 5v or 3.3v pins which is weird.

Also, when I have nothing plugged into the board other than the usb cable and try to measure voltage across the ground and power pins I get 1.5v from the 5v pin and 0 from the 3.3 pin

5v pin reading

3.3 pin reading

This is a brand new out-of-the-static-bag board and I'm having the same issue with another board of the same type.

I feel like there's something I'm missing. Any ideas?

  • Please verify your black wire is connected to GND and not to D3.
    – VE7JRO
    Jun 14, 2020 at 20:56
  • @VE7JRO yeah, the angle is odd in the picture, but the ground is definitely connected to the ground pin and not d3. I hooked it all back up just now to double check, still the same readings. Jun 14, 2020 at 21:03
  • Is it possible to measure the voltage with the ESP32 un-plugged from the prototyping breadboard? One last suggestion, try a different volt meter if you have access to one.
    – VE7JRO
    Jun 14, 2020 at 21:23

1 Answer 1


Try measuring the voltage against a different ground pin? I had a similar problem and discovered the pin next to the 5v input pin wasn't actually ground. Not sure why this would affect sketch uploading though..

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.