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Alternative Use for Xiaomi Water Sensor

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  • Alternative Use for Xiaomi Water Sensor

    A Xiaomi water sensor and one of these pressure mats from Amazon makes for a great occupancy or presence detector. A water sensor is basically a normally open (NO) dry contact, and the Xiaomi sensor has 2 screws underneath that you can hook the leads from the pressure mat to (the alarm portion of the mat is not used). The water sensor is waterproof and immersible, so outdoor deployment is possible. However the contacts should be covered with a silicon sealant to prevent false triggers from water contact.

    Click image for larger version  Name:	watersensor.png Views:	1 Size:	114.2 KB ID:	1299127

    Once the leads are secured to the screws, step on the mat and the dry contact closes to turn the water sensor "on". Step off the mat and the contact returns to open. This can be very useful for places where motion sensors are not practical (bedroom) or where you want a presence sensor to be incognito (beneath front door mat, beneath couch cushion, etc).

    Want to lay on the couch to watch TV but you don't want the lights turning off from lack of motion? Slip this under a cushion, change your lights off event to run only if the couch is unoccupied and problem solved. Or do the opposite if you want the lights to turn off when you lay down on the couch. Possibilities are endless.

    Enjoy!

    --Barry

  • #2
    Barry, thanks for the post and the use of the pressure mat as the presence sensor makes very good sense.

    As I get older I tend to stay stationary longer and enabling multiple variations presence sensing would provide greater flexibility and more granular control.

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    • #3
      Yes thanks. I will buy the exact same part. This years or next .

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      • #4
        Anyone try a thin device that can go under carpet or wood... not notice any thickness change?

        like this...
        https://smile.amazon.com/SENSING-RES...ustomerReviews
        and
        https://smile.amazon.com/Pressure-SF...ustrial&sr=1-5

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        • #5
          Originally posted by Ltek View Post
          Anyone try a thin device that can go under carpet or wood... not notice any thickness change?

          like this...
          https://smile.amazon.com/SENSING-RES...ustomerReviews
          and
          https://smile.amazon.com/Pressure-SF...ustrial&sr=1-5
          Owww..... Like those.... could use them in Europe
          -- Wim

          Plugins:RFXCOM, HSTouch Server, Squeezebox, BLGData, Restart, Jon00's Perfmon and Network monitor, WeatherXML, BLBackup, TenScripting, BC4, Pushover, PHLocation, JowiHue, Zwave, Sonos
          650 devices ---- 336 events ----- 40 scripts

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          • #6
            On second thought, using these for the wate sensor might drain the battery I suppose as they are resistors? Guess still need to find a on/off matt
            -- Wim

            Plugins:RFXCOM, HSTouch Server, Squeezebox, BLGData, Restart, Jon00's Perfmon and Network monitor, WeatherXML, BLBackup, TenScripting, BC4, Pushover, PHLocation, JowiHue, Zwave, Sonos
            650 devices ---- 336 events ----- 40 scripts

            Comment


            • #7
              Originally posted by w.vuyk View Post
              On second thought, using these for the water sensor might drain the battery I suppose as they are resistors? Guess still need to find a on/off matt
              They should be just an open circuit at zero resistance. However, it only takes a few grams of pressure to begin closing the circuit. So if placed under a door mat or something heavy, they might indeed drain the battery. Inside a fluffy pillow or under a mattress topper might be a better use.

              --Barry

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