I know if the door is closed, but is it actually locked?

A reed relay with a magnet in the lock linked to a Visonic MCT-302.
DJ: Also test with micro switches so you don’t need a magnet (Microswitch)


  • (DONE) Buy reed relay (Conrad.nl)
  • (DONE) Get a tiny magnet (thank you JayBee)
  • Find a way to mount the magnet and reed relay
  • This is the most difficult part!
  • (DONE) Link to Visonic MCT-302 door sensor
  • No problem. Wiring is in place
  • Test, document and publish



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