Is there a command or something that I can use in rule machine to force hubitat to shut down.
I'm not sure it's really necessary but the goal is to monitor a device that when it loses power to shut down habitat. My habitat is on a battery backup but if my power goes out I would like habitat to shut down gracefully.
Is this just a dumb idea? Not sure it would work as I would expect hubitat to only have the option to restart.
Here’s a driver that will do a similar thing in device form. I use this driver for a similar purpose, to shut the hub down when the ups battery gets low.
Not dumb at all. Power loss can really mess up the hub at times.
Yeah. A bit tricky as the device "Monitoring" would need to be battery powered too. However, I figured I can use a relay that has 120 running the coil (or low voltage coil powered by a wall wart). If the 120 is lost the relay opens. The zwave device (ecolink contact switch or something) would then report the "Open" condition triggering a shutdown. Or maybe a 10min timer then shut down to buffer against quick power glitches that my UPS would hold up to.
I think I can make that work. Thanks.
I think most people do a timed shutdown like you are suggesting. I think you basically have the right idea with the relay and contact sensor. There are at least a couple threads on here about power loss monitoring using a sensor like you suggest.
There are several devices posted that can do this. The ring range extender is one I know off hand. It has main power and battery and can tell you when it is on which. I plug that into a regular outlet and use it's state to control the hub shutdown.
Just an option. Search the forum for details.
One issue with using a zwave contact sensor to monitor the relay is if the z-wave contact sensor is repeating through a powered z-wave device. With that said I’m basically doing the same thing with out any problems yet.
Good point. This will probably be close to the hub so that shouldn't be an issue.
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