Infrared Emitting
Electronics project help?
I am trying to build an automatic room light controller that will turn on a lamp when a person enters a room and maintains it in the on state as long as the room is occupied. once the room is empty, the lamp will switch off. I intend to use a PIC for this project, together with an infrared emitting diode and phototransistor for detecting entry and exit. But my major problem is making the circuit direction sensitive. How can I differentiate between entry and exit? I would really appreciate any help I can get. Thanks
Your idea has been existed long long time ago,a product called motion detection light using in the backyard or stair. $10 a piece sold in most warehouse store. You may buy one , open it and study it. It has a build in infra red transmitter and receiver mount together as a piece of parts, you can control the angle by adjust the window direction or narrow the beam with small size of openning. It also has a delay timer to control the time when motion is no more detected.
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