If the power supply is stable, thought maybe you were using batteries, I will have to ask if there is a load on the divider.
Other than that, I will have to guess that the pot becomes unstable with a little heat.
Why not use fixed resistors?
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If the power supply is stable, thought maybe you were using batteries, I will have to ask if there is a load on the divider.
Other than that, I will have to guess that the pot becomes unstable with a little heat.
Why not use fixed resistors?
Dave
Always wear safety glasses while programming.
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And it's a 20K pot! I'd bet a bump from the other end of the table would knock it out of whack.Originally Posted by mackrackit
Try a smaller value pot.
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isaac, The maximum recomended input impedance for all Microchip Processors is 10K....
Dave Purola,
N8NTA
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its not for the input the pic
but i suspect its got to be the pot would try a lower vaue like 12k
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Same thing most likely applies. Lower the values of the resistors.
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Daves' suggestion of using a fixed resistor is good too. I would replace at least one pot
with a fixed 1%, and if using an A/D input to read this I would drop the pot to around 5K
with the fixed value set to limit total current.
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