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The Magnetic Door Contact Switch consists of both a reed switch and magnet, both of which are housed in a separate plastic enclosure. The switch is closed circuit when the magnet is present and open circuit when the magnet is removed (i.e. the door is opened).
A reed switch is an electromagnetic switch used to control the flow of electricity in a circuit. They are made from two or more ferrous reeds encased within a small glass tube-like envelope, which become magnetised and move together or separate when a magnetic field is moved towards the switch.
1 mH Inductor 
5A Mini DC Motor PWM Speed Controller Module 
Magnetic Door Contact Switch 
