> Maybe another micro on the HV side could be added to do the 
> conversion but
> this also needs a PSU,
> ICSP for programming and opto isolators.

You have a voltage on the HV side, so deriving 5V could be simple if you
can afford to dissipate some heat. The PIC would do just measurement and
sending the result, I see no real need for ICSP (compare it to an analog
solution: you must get that right first time too!).

I don't say this is the ideal solution, just compare it to other
solutions.

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