IR based entry detector alarm is useful for someone crosses the Gate or door of house when is left open.. It can alarm you and notify you that someone entered into the door or place.. This project will be used at Doors/ Entrance of office to get alert the owner or admin to notify someone crossed the gate or door of the location.
IR LED will send and receives signal when some one interrupts the IR signal alarm will be started to make alert of any burglar or theft.
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Circuit diagram courtesy and project test : Electronics for you Maganize and Team.