Multiple potentiometer

o_wan

hi,

I'm using 2 RC time circuits (1 in PIN 0, 1 in PIN 1) and debug 2 potentiometers' reading. I've found that potentiometer 0's reading will changed by both potentiometer 0 & 1. I'm currently using the same power source which is the default +5V.

How can I separate 2 readings? Hence it doesn't alter each other.

Cheers,
A

Bruce Bates

o_wan -

A diagram or basic description of how you have these pots wired up would be most helpful in trying to solve your problem. Are these EE-POTS (solid state) or mechanical pots?

Regards,

Bruce Bates

o_wan

hi,

I'm not sure what kind of pot is that, please see attached pic

Schematics:

BS P0 --> 220 ohm --> 0.1 uf cap --> VDD
POT (PIN 2) --> 0.1 uf cap
POT (PIN 1 & 3) --> GND

Amaral

That's a Single mechanical pot , Please check your wiring , and IF you can , draw that for us. I really think is an wiring problem.

Ricardo Amaral

Jon Williams

If you have both outer terminals wired to ground you've decreased the range of your pot; you've essentially created to parallel caps to ground and the resistance will always be something less that the smallest side. Disconnect on side from ground -- you only need two connections: the wiper (center) and one leg.

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Jon Williams
Applications Engineer, Parallax