>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 22 September 2005 18:48
>To: 'Microcontroller discussion list - Public.'
>Subject: RE: [PIC]: Some laptops do have serial ports
>
>
>> > 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.


How about this one?

http://www.mikerj.clara.net/keypad.html

Regards

Mike

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