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A reed switch with a small permanent magnet attached to the door to>
actuate it can do the detection very simply, cheaply and unobtrusively.
<https://en.wikipedia.org/wiki/Reed_switch>
In this instance, old tech can be best.
>
True. I think I've got a reed switch around someplace. However. for $9 I
got 5 HC-SR501 PIR modules, 2 mounting brackets with screws, a small
screwdriver, and some Dupont wires. You use what you has :)
True, I could get 20 glass reed switches for that, but then I'd have to
figure out a mount. The sets that are designed for doors and windows are
more expensive.
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