My original proposal for a door lock monitor using the EnOcean STM 320U Magnetic Contact Transmitter Module is shown in Figure 1. In this proposal, I planed to remove the reed switch from the module and re-attach it with wires so that the reed switch could be placed in a hole drilled into the frame and sit just shy of the bolt went the lock was engaged. The bolt would have a thin magnet glued to it to provide the magnetic field to engage the reed switch.
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