PARASOLL door/window sensor.
This sensor runs off a 1.2 or 1.5 AAA battery, which increases the size of the sensor.
When connecting it to a 3V power supply, it does work. It might be possible that the DC-DC converter can be omitted in this case. However, the hall-effect sensor emits a higher voltage level that represents a closed state.
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R1 - 1 M
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R2 - 1 M
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R3 - 100 k
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R7 - 200
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R12 - 0
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U1 - EFR32MG24B020F1536IM40 (microcontroller)
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U2 - ? (hall-effect sensor)
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U3 - OC6811 (DC-DC converter)
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Y1 - 39 Mhz