INPUT_PULLUP on pin 17?

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randallman
Posts: 8
Joined: 17 Jan 2021 20:45

INPUT_PULLUP on pin 17?

Post by randallman »

Hello,

Does anyone know what, if anything, could be causing INPUT_PULLUP to not actually pullup on pin 17 (INT0)? It works on pin 18 (INT1) and furthermore it used to work on pin 17. Is it possible I did something or that something happened to kill this 20k internal resistor?
randallman
Posts: 8
Joined: 17 Jan 2021 20:45

Re: INPUT_PULLUP on pin 17?

Post by randallman »

Oh boy, so yeah... I switched pin 17 from INPUT_PULLUP to INPUT and then used a 10k resistor off of 3.3V that is also powering the Zuno (from a buck conv) and I have a really nice square wave now. Unfortunately, it's still not triggering inputs. Do I have a dead a** pin? Is that what's going on? Prior to this, my input looked like rf noise on the scope with periodic pulses, but not high enough to call it a pulse due to the pullup not working. I guess my last test would be to try to use it as an output, but it really doesn't matter since INT0 *must* be pin 17 right?

70 bucks, down the shatter on account of entropy.., IDK even if it was my fault or if it was random nonsense. Nothing changed on my end. Any other forensics I could do? Pin 18 is fine and accepting interrupts (INT1) and the pullup works fine.
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PoltoS
Posts: 6338
Joined: 26 Jan 2011 19:36

Re: INPUT_PULLUP on pin 17?

Post by PoltoS »

How do you set up INT0 ? does digitalRead get correct values on that pon?
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