> > Now for something completely different: I think I have a 
> realy original
> > idea (about reading a matrix keyboard with very few pins).

> "PICkit 1 Tips'n'Tricks" #7:
> http://ww1.microchip.com/downloads/en/DeviceDoc/40040b.pdf

I did not know about that one, and I did not see it in any of the
patents I checked either. But it is not the idea I have. 

Note that trick #7 is not a complete description: no optimal resistor
values, no formula to derive these values, no analysis of the required
accuracy of the resistors (both for various matrix sizes). If it can be
done with 1% it would be usefull, if it requires 0.1% it might not be
cost-effective, if it requires better than 0.1% it is probably
infeasible.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist