Maybe you this page will give you some ideas
look at column hardware , item switches at
  http://pic.flappie.nl
For a robot (2 front and 2 back bumpers) I just designed reading 4
switches, with partial multiple key detect from just one 16F628
comparator input, without using unreliable capacitors :-)
Stef Mientki

Brooke Clarke wrote:

>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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