i want to do this project.. an electronic circuit that when someone comes through the door the alarm starts... like an alarm system i mean..
what is the name of the device i need to use that can give a signal or smthng to the circuit when someone crosses the door! i see them doing that using a laser beem in movies but i guess there is smthng more real to do that!!! :lol:
can u help me guys? hope im clear!
what is the name of the device i need to use that can give a signal or smthng to the circuit when someone crosses the door! i see them doing that using a laser beem in movies but i guess there is smthng more real to do that!!! :lol:
can u help me guys? hope im clear!