DYI Xiaomi Binary Contact Sensor

[ben53252642]

My DYI Xiaomi Binary Contact Sensor using an off the shelf Xiaomi Aqara Door Sensor

Final product, when wires touch contact is reported as "true" by the sensor, when wires are not touching it reports "false".

Photos go over a few posts due to the attachments limit.

1) Open Case

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2) Remove the sensor from case

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3) Remove the magnet sensor from the board

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[ben53252642]

4) Solder wires to each terminal the magnet sensor was attached to (remove the battery first for safety)

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5) Drill holes for the wires on the side of the case

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6) Re-assemble case and install the battery

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[ben53252642]

7) Product re-assembled ready for use, looking very professional!

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8) Connected it to a magnetic reed switch, working nicely

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9) I'm using Zigbee2MQTT and Node-Red to use the sensor with Domoticz via MQTT, here is a screenshot of Node-Red output when I move the magnet to and away from the switch.

node-red zigbee2mqtt output.JPG (73.75 KiB) Viewed 2859 times

After some time (about an hour for me) sensor also start reporting battery level which is nice feature.

Code: Select all

payload: "{"contact":true,"linkquality":70,"battery":"100.00","voltage":3055}"

[Thuis]

I'm curious, what is the purpose of doing this ? You take the functionality of the sensor put wires on it and have the same functionality.

[LouiS22]

I'm curious, what is the purpose of doing this ? You take the functionality of the sensor put wires on it and have the same functionality.

+1, really don't understand this

[ben53252642]

My application has 6 binary sensors in a series circuit. If any of the 6 cupboard doors are opened the circuit breaks and the binary switch is triggered.

It just turns on a light in the cupboards so makes no sense to use 6 separate battery powered sensors.

[hoeby]

Maybe his example is not the best. To modify it and an other door sensor.

But this is a nice example how to make an input device which could be connected to do domiticz.
Maybe jou have a device with an output which couldn't be connected to domoticz. Using this modified door sensor, it could be possible