Hello there, I have been designing a remote input/output device.
The device itself is powered by a 12v power supply. I cut the voltage down to 3 with a zener diode so my Xbee works fine.
The problem is that when i put certain pins in INPUT mode, they still emit current/voltage that ruin my mesures as i am doing a voltage divider to get the voltage from my sensors back down to 3V.
So when the input of the 12V sensor (equivalent to a button) is not open, there is still current going through my second resistance causing me grief.
Any idea of why is that, and why it doesn't do it on all DI?
I am using IO 0,1,2,3,4 as input, IO 6 as output.
And the ones that are having a false positive because of that voltage varies.
Thanks in advance for the answers guys