Arre temperature/humidity sensors failing

Hardware
1

A few months ago, I installed some Arre temperature/humidity sensors. Earlier this week, two of them became unavailable and have not come back online despite HomeAssistant restarts.

I am looking at one of them now and it seems to be totally dead: it is not detected when scanning for a new device, short and long presses on the reset button have no effect, changing the battery has no effect and the unit’s internal light never shines.

Has anyone else had this happen? Is there something that I am missing? This is quite concerning.

2

I would make contact with the support of the maker of those to see if you can get replacements or just replace them with another brand.

3

So far as I can make out, there are no other Matter sensors that detect both temperature and humidity.

4

https://www.matterdatabase.com/category/temperature-sensors

I count 4 on that page and I have a swtichbot hub 2 that connects to my HA instance using matter over wifi and is a bridge for my switchbot bots that are bluetooth.

5

Looking at that page, we have the following:

  1. the LG temperature and humidity sensor, which is listed as “rumoured” and is not available;
  2. the very Arre sensor that I am having trouble with;
  3. a Meross sensor that is Bluetooth and wi-fi rather than Thread; and
  4. a Shelly sensor that is Bluetooth and wi-fi rather than Thread (and whose documentation gives no suggestion that it is Matter compatible).

From what I can see, the Meross sensor is huge. The Shelley sensor looks a little smaller, but does not have the little stand that the Arre sensor has that I need to make it work in my downstairs lavatory where there is very little space and I stand it on the protruding edge of the door frame.

6

What you can do when it comes to ones without stands is use say 3M Command Picture Hanging Strips (I use the large ones and just cut them down to fit) to have a stick on point for devices.

I have it holding power strips, the hub 2, my aoetec sensor etc and they hold well for a good long time and the come off clean as long as you keep that pull tab side as the side you cut down to should you need to remove it in the future.

7

I have just tested the batteries in both and found them to be flat. I only had one spare, which I have replaced, and the one that I replaced works. I am not sure why an earlier attempt at replacing the battery was not successful.