Hi, I am trying to design a circuit that is cheap, reliable uses very little = power and possibly decodes a 'signal' of some sort? There were things around that you clapped your hands and the beeped back = at you, how long did the batteries last as I want 1 year if possible? Any other interesting ideas anyone, its over to you to discuss Gary Baker -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads