> I got a project ready to go into serial production and now my customer
> stepped up with an additional idea. He likes to have different features with
> 2 differerent models, but hardware unchanged.
> It would be possible to load differerent software by ICSP, but I had another
> idea this morning:

Configuration jumpers are a tried and tested idea. There are even 
special PCB shapes (solder jumper) that are designed to accept a little 
blob of solder to make a sort. I'd suggest you use those instead of 
shorting two normal islands.

As for your method of reading the pin: outputting a 0 on a pin connected 
to +5v is definitely beyond the specs of a PIC. How long it will survive 
and how it will fail is anyone's guess. Probably no problem for a 
child's pet, but a definitive no-no for a nuclear power plant.

How about using the internal pull-ups? Or use a 3-wire solder jumper? Or 
solder a small (1k ?) resistor (a 1206 SMD would probably fitt well) 
instead of the short?

-- 

Wouter van Ooijen

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

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