>  Quite difficult because the piezo is able up to 120dB noise 
> at 10cm away.
> It need power for this, not only lemons...

but not continuous, so use an elco? some beam robots use this principle.

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