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How to create magnetic alarm switches?

theRatty
By theRatty
in Hobby Electronics
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Posted

What is the lowest tech way of having a break in an electromagnet trigger an electronic impulse for use in a automatic light when a door opens?

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Posted

You're looking for a "cupboard light switch"

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Posted

Reed switch.

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Someone probably already makes a box that does all of this though.

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Posted

A reed switch is held closed by a magnet. So something to actuate an alarm when the circuit breaks.

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The alternative is have the magnet go past the reed switch as the door opens, closing the reed long enough to actuate a relay which holds the circuit closed and keeps an alarm ringing.

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An alternative, a push to open circuit push button switch. They usually work the other way so might not be easy to find. You could make one with bits of spring metal.

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Posted

Definitely a reed switch. Cheap, simple, passive. I have used microswitches for cupboard doors but I don't think I would use a contact switch for an actual door.

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