I use PICs in classes. The PICs are on a PCB, but otherwise unprotected.
The students buy the PCBs, so they can work at home. Informatics
students can not be expected to know much about static electricity, so
for all I know they might use it to comb their cat's hairs. I have hadd
some pretty weird failures previous years, so it might be a good idea to
put some form of protection on all PIC pins. My idea is a resistor to
ground for each pin, but what value? Would 1M be sufficient, or should
it be lower?

And what about the one pins that probably won't like any load, even 1M:
the oscillator input? 

Wouter van Ooijen

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

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