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April 26, 2022 by CIRCUITS DIY

In this tutorial,


The magnetic reed switch is the electrical switch operated by the magnetic field, that controls the flow of electrical current in the circuit. The reed switch has two types. For the first type, when there is an applied magnetic field, the contacts become part of this magnetic circuit. Hence the contacts make the opposite poles and attract each other. Thus, called 'Normally open contact'. The second type of switch is closed in normal conditions and gets opened while the applied magnetic field. Therefore, called 'Normally Closed Contact'.

Hardware Required


Circuits Diagram

Working Explanation

Build the Door Security Alarm Circuit using Magnetic Reed Switch according to the above diagram. For a video tutorial, click the below link.

door security alarm project.JPG

Application and Uses

  • In the home, office, and industrial automation.
  • In banks, private lockers, etc.
  • Can also be utilized in automotive applications

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