0

I am trying to convert the signal from digital pin 2 on my Uno to 3.3V. I set up a voltage divider with 3 x 1000 ohm resistors. When connected to ground and 5V the divider circuit generates 3.3V correctly, with a calculated input current of 1.7mA. However I connect it to a digital pin, the digital pin voltage drops from 4.8V to .37V. I thought the digital pins were to support 40mA, I was assuming 40mA at the 5V supply voltage. Is my Uno malfunctioning?

Thanks

  • Sure you got the pin set up as an output and have written a high/1 to it? (have to ask). What's on the output of the voltage divider - i.e. between the resistors? Something with a high/low resistance/impedance? – jDo Apr 11 '16 at 0:23
  • Just figured out I didn't have the pin mode set, it works fine now, thanks. – perigalacticon Apr 11 '16 at 0:41
1

Just figured out I didn't have the pin mode set, it works fine now, thanks.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

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