If a bathroom door is closed, the bathroom is unavailable. The input I used for detecting the status of the door are inductive proximity switches. Inductive proximity switches sense objects by generating a magnetic field. When a metal object reaches a certain distance from the sensors head, it will open or close a circuit (depending on the model). By placing a screw in the door, the sensor can be triggered when the door is closed.
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![Bathroom Door Sensor Bathroom Door Sensor](https://www.covesmart.com/static/460a8a8f944f7d8e61aedf19d1e04ba3/2fcd1/door-sensor-angle.png)
![Bathroom door sensor light Bathroom door sensor light](/uploads/1/2/5/7/125770391/796788187.jpg)
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