Search on this link, is a very usefull book.
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http://ww1.microchip.com/downloads/en/DeviceDoc/40040b.pdf
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enjoy it
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Pablo Ginhson
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> Date: Thu, 28 Jun 2007 18:19:39 -0700> From: marcel.duchamp@sbcglobal.net=
> To: piclist@mit.edu> Subject: Re: [PIC] Multiple momentary button in 1 si=
ngle pin> > Ariel Rocholl wrote:> > Hi all,> > > > I have only 1 pin availa=
ble in a PIC16F micro but need to read 5-10> > momentary buttons, and do no=
t want to use any other additional external IC.> > I figured out a way to w=
ork this out using 1 single A/D pin to differentiate> > each button from th=
e rest, provided I have different R-R bridge for each> > button, therefore =
if no button is pressed the A/D should read 5V, but as> > soon as a button =
is pressed, a R would move that to, say, 2.8V. If all the> > resistor combi=
nation are different and I can work with at least> > 0.25Vdistance between =
them (> > e.g. 0.25V, 0.50V, 0.75V, 1V, etc), looks like a robust and solid=
 solution> > to me.> > > > Only drawback I can see is no multiple buttons c=
an be pressed at a time and> > give a valid value, but this is not a requir=
ement.> > > > Do you see any problem with this approach? Anybody used somet=
hing like this> > before? Any other option you can suggest for multiple but=
tons, 1 pin and no> > additional circuitry?> > > > Thanks in advance.> > > =
> I used this technique to read a 12 position rotary switch; it worked > ve=
ry well. Of course, this is a bit different from reading separate > pushbut=
tons.> -- > http://www.piclist.com PIC/SX FAQ & list archive> View/change y=
our membership options at> http://mailman.mit.edu/mailman/listinfo/piclist
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