Electronic Circuit Design

I am working on an access system, multi-user code for entry to restricted areas. I designed one that uses purely hardware but its a bit complicated and bulky, though it works perfectly. Might you have any ideas on implementing microcontroller based… more »

I am to build a circuit that operates off some kind of sound input into a sound activated circuit, preferably some kind of voice operated relay circuit. This relay is then to operate some kind of signal transmitter such as RF which activates a signal… more »

i am researching for a project for industrial automation . in this i am having one concept that is following below if any one of person is in room the electrical power should be connected in this time one or more persons are entering in side that room… more »