S sharafat New Member Sep 23, 2006 #1 Hi. I am trying to build a door security system using IR LED and photoresistor. When anybody passes through the IR, an alarm rings. Can anybody help me in providing the ckt? Thanks.
Hi. I am trying to build a door security system using IR LED and photoresistor. When anybody passes through the IR, an alarm rings. Can anybody help me in providing the ckt? Thanks.