Does anyone know of a door or contact sensor that is easily repurposed? I’m finally getting around to tying in my hardwire smoke detectors. I just need a dry contact sensor that I can close with a relay. A lot of the links I’ve seen on here are for sensors no longer in production.

I have a bunch of these: https://www.monoprice.com/product?p_id=38135 Very stable and work well. Like most contact sensors there is a magnetic reed switch that activates when a magnet is near. Hacking would be a simple matter of removing the reed switch and wiring in what ever contacts you want. …

Easily hacked door/contact sensor

Devices & Integrations

JDRoberts September 19, 2019, 2:34pm 2

FAQ: List of devices with dry contact input from external sources

Topic		Replies	Views
ADT Door Sensor Repurposing Projects & Stories	19	5208	November 30, 2019
Cheap contact sensors (~$20) with external switch "capability"? Connected Things	4	4004	June 7, 2019
Retrofit Standard Deadbolt as Contact Sensor? Projects & Stories project_locks	6	2791	June 10, 2017
Need a recommendation for a device with dry contact sensor and relay Projects & Stories	2	2245	May 15, 2016
Easy Doorbell Integration Projects & Stories project_doorbell	45	12768	September 12, 2018

Easily hacked door/contact sensor

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