Marcel, thanks for the input, you either has a nice memory or a very well
organized archive.
After little search I found the thread, but it was actually from Bob Axtel,
he made this page available for public access, so thanks Bob:
http://www.piclist.com/techref/microchip/sw7_on_1pin.htm

I think I will use pretty much the same approach, I can see clear advantages
in putting resistors in serie rather than paralel as it was my initial
thought. As my application has plenty of free EEPROM, what I would do is to
have a simple routine calibration that will overcome the resistor low
precision, so after activating the routine, pressing the buttons one by one
in order will store a calibration number on the EEPROM. I am using momentary
pushbuttons that have metal contacts, so I do not face the same problem as
carbon membrane keyboard, the initial calibration will probably remain valid
for a long time.

Thanks all for all the posts with info, it really helped a lot.

2007/6/29, Marcel Birthelmer <marcelb.lists@gmail.com>:
>
> Hi Ariel,
> Our very own Russell McMahon posted a schematic and code to that
> effect a while ago on this list. The subject line was "[PIC] Reading 7
> Pushbutton Switches With ONE PIC pin". You can find it in the
> archives.
> Regards,
> - Marcel
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-- 
Ariel Rocholl
Madrid, Spain
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