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Have voltage and output current on certain DI pins.

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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
asked Aug 1, 2016 in RF Solutions and XBee by Ownezx New to the Community (1 point)
recategorized Sep 7, 2016 by LeonidM

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1 Answer

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Have you disabled the internal pull up resistors?
answered Nov 10, 2016 by mvut Veteran of the Digi Community (15,412 points)