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HELP! All my analog in pins bleed into each other!
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HELP! All my analog in pins bleed into each other!

by JoeELP on Wed Apr 01, 2009 6:17 am

Basically, I think I may have fried something at this point. I dont remember it doing this before.

I have a protoshield, which looks like I soldered it correctly.

Any analog input, be it a pot or something else, basically bleeds its value into the other pins. I've noticed with the pot that pin 0 will be 1020~ish, pin 1 will be ~900, 2 ~800, etc. it sorta holds true if the pot value is 0, the others will rise slightly... This is not as repeatable as when its high. Also, if you put a pot on pin 2 or 3, say, the incoming phantom values will decrease with pin-distance on both sides.

what do I do to fix this? Am I SOL?
JoeELP
 
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Re: HELP! All my analog in pins bleed into each other!

by adafruit on Wed Apr 01, 2009 10:16 am

all analog inputs need to have some sort of measurement going in from a pot or sensor or what have you. otherwise they float and floating pins pick up whatever voltages are around them.

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Please be positive and constructive with your questions and comments.