ST Leak Sensor Below 0 degrees C

[Cobra]

OK.. So it's cold here.. -1 C

But my ST leak sensor is showing somewhat warmer..

This works fine down to 0 degrees.
as soon as it went below ) ... this is what I got!

Andy

[Cobra]

This is some logging I was doing at the time in a test app...

Although it says 'average temp' this was the only sensor configured at the time

Andy

[Tony]

This is similar to the bug I opened with support Feb. 16 (request 10230) on temperature reporting with the generic zigbee contact sensor driver and motion sensor driver. Still is an issue with these sensors as well on the current firmware. Must be using the same algorithm

Bug in logging Iris Contact Sensor temperature?

I have a couple of Iris contact sensors paired to Hubitat, one brand new and one that I had been using for a long time with SmartThings. I just noticed that when the reported temperature hovers near 32F both of them report 1211 degrees. Granted, they are spec'd to operate 0-40C but I suspect something else may be going on here, possibly with the driver code handling the 0 degree C temperature value. Reason I don't suspect the sensors is that I've been using several of these (motion and con…

[mike.maxwell]

I
l look into this

[Cobra]

Thanks Mike
I’m using the generic zigbee driver

Andy

[veeceeoh]

This just has to do with the way the raw temperature hexadecimal value send by the device is handled.

It looks like with your sensor the raw value sent jumps up to 655 when the temperature crosses down below 0 C.

So the method to calculate would just need to subtract 655 whenever the raw value goes over a threshold (like over 100, since we’d be dead if it was 100 C!!!)

[mike.maxwell]

the returned value from this cluster is signed, and we’re not treating it as such in the drivers…