I looked at a digital pots (Xicor and Dallas) a few years ago.  I didn't use
them because the wipers could handle very little current. If I'm right, you
will probably have to use a transitor after the Digital Pot - your required
resistance may change.  (DS1267)

regards,
Andrew





> >
> >Hi,
> >I am trying to build a PIC IR Proximity Detector, the bascic TX circuit
> >is figure 2 on this page >>>
> >http://www.rentron.com/Infrared_Remote_Control.htm
> >If I add a small resistor (10-330 ohms) between the IR led and gnd,
> >it changes the distance the RX circuit detects a reflection from
> >(10cm -120cm)
> >So, I thought if I add a digital pot instead of manually changing
> >the resistor,
> >I could make a rudimentary IR Proximity Detector.
> >Problem Digikey only sells a 10k digital pot, I was hoping to find a
>smaller
>
> >
> >one,like <= 1k, anybody know where I could get one ?
> >Is their an easier way to do this with a PIC ?
> >I already looked at the Sharp GP2D02, but I wanted someting cheaper.
> >
> >Thanks in advance,
> >                   Kevin
> >
> >P.S. I am a programmer not an EE, so my electronics background is
>limited.
>
> >
> >--
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> >ways.  See http://www.piclist.com/#archives for details.
> >
> >
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