The front door was issuing 5 6 knock alerts a day.
Door vibration sensor.
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Eddy current sensors are non contact devices that measure the position and or change of position of a conductive component.
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These sensors operate with magnetic fields.
It s a very solid wooden door so stray vibrations don t seem likely and i was able to witness a few while i was right next to the door and was able to confirm that there was no wind thermal expansion etc.
Lately i ve been getting false positives.
Door sensors use a reed switch and magnet as a sensor.
One end attaches to the door frame while the other end attaches to the door itself.
Vibration sensors just had too many false alarms on glass.
A door sensor can be defined simply as a motion detection for your doors and windows.
The smartthings multi purpose sensor knows when your doors open or close like any other contact sensor.
The sensor has a probe which creates an alternating current at the tip of.
As long as these two pieces are less than two inches apart the alarm won t sound.
But this versatile device can also tell you when it senses vibrations falls at an odd angle or senses temperature out of the ordinary.
My garage door is double width so with wind blowing i can see how the sensor was picking up movement the tilt sensor may not catch the door being opened just enough for a person to slide underneath so it would have been better to have acceleration as well to detect any movement.