15-02-2010, 17:04
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Mad Scientist
AKA: Me
 FRC #2040 (DERT) Team Role: Engineer
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Join Date: Apr 2005
Rookie Year: 2003
Location: Peoria, IL
Posts: 1,964
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Re: Connecting switches/pots to PSoC
Quote:
Originally Posted by Dave Flowerday
Basically, the unconnected inputs are very high impedance and are picking up the signal that's on the other input. There's no electrical connection between them and the PSoC isn't doing anything to make it happen. The signal traces for the unconnected analog inputs are acting kind of like an antenna and picking up the AI01 signal that is nearby.
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... and this is exactly why most DAQ modules have either pull-up or pull-down resistors.
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"We are not now that strength which in old days moved earth and heaven; that which we are, we are;
One equal temper of heroic hearts, Made weak by time and fate, but strong in will
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