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

[madmarko]

Virtual devices! Thank you! You learn something new everyday. Lovely stuff

[Declankh]

Somewhat late in replying but I use the guard line drivewaynsensor with an electromagnet driving a sonoff contact sensor.
I use it to trigger Alexa announcements via a virtual device

See here

Guardline driveway alarm with contact sensor?

Update on this. I got an 12v 50N electromagnet this morning and hooked it up to the guardline 12v outputs on the base unit. The electromagnet will trigger the sonoff ZigBee contact sensor as long as it’s positioned correctly which is a little fiddly. It works when on the top rather than the side, and slightly off centre. So doing this means I can create routine in smart things based on this . Note that the routines need to trigger on close rather than open. [20230428_150121]

[rmjb]

I’m just looking at something like this myself for a project.
Would the Shelly Wave i4 qualify? Shelly Wave i4 – Shelly USA
It looks like it was built only for this purpose.

[JDRoberts]

Yes, that would also fit the category.