Thread: Rotary Position Sensors
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Unread 18-11-2005, 10:15
Mike Bortfeldt Mike Bortfeldt is offline
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Re: Rotary Position Sensors
Don,

One thing you may want to try is to use a 1k or 2k potentiometer for your position measurement rather than the 100k. From Section 19.1 A/D Acquisition Requirements - of the PIC datasheet: "The maximum recommended impedance for analog sources is 2.5 k ohms." When we've used higher resistance potentiometers, we've seen a noticeable lag in the A/D value from the actual position. However, other than the slight time delay in acquiring an accurate position measurement, I've used inexpensive Radio Shack pots as well as some Bourns precision potentiometers with good results. (Note that this is only for the RC, not the OI where 100k pots are required.)

Mike