Hello:

The Piher N15 trim pot has no mechanical stop and the lowest value is 5 K ohms.
I have come up with a simple circuit that puts a small resistor between the pot
and ground then with a 4K7 resistor in series with the wiper going to the A/D
input pin you can put a NO Push Button switch from the PIC pin to ground and
have a pot and switch on one PIC pin.  I think you should be able to have 2 or 3
NO PB switches and the pot on a single PIC pin, but so far have not come up with
a circuit to do that.  Maybe it needs a transistor or op amp to work and have
less than 10 K Ohms source resistance for the PIC A/D input?

< http://www.piher-nacesa.com/pdf/n15USA.pdf >

Does anyone have a circuit for using 2 or 3 switches and a 5 K Ohm pot on a
single A/D PIC pin?

Note that you should be able to use this pot in a fashion similar to a 10 Turn
pot, except there is no restriction on the number of turns.  Also I think there
is a way to connect two pots together to make a 360 degree position sensor.

Thanks,

Brooke Clarke, N6GCE
http://www.prc68.com

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