Post box mail drop alarm / Railway gate motor operation / Auto door open light
The main purpose is to design this project to provide an indication for open doors to make sure that all is ok. This project comprises of a reed sensor and LED for indication. The reed sensor like a switch is operated by an applied magnetic field. When door is closed the reed sensor comes closer to a magnet attached to the door frame its contacts get closed to drive an LED to be ON in the circuit indicating everyting OK. If the door is open the LED will be OFF indicating door not properly in closed condition.