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Door/Window sensor

 I'm wondering if there's a door or window sensor that would allow me to tell if a window or door is open /closed

I'd like you use the sonoff  to turn on a heating source if a room is colder then a certain temperature  but only if the window is closed

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A product exists but currently only shows that a door/window has been opened.

It would be good if the sensor also reported when the door/window is closed. This is very useful for a few uses like the above or in conjunction with the inching unit to know remotely if eg. a garage door has been left open .


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