SONOFF Sensors temperature_precision

deCONZ General Support
1

I always wondered why some of my SONOFF sensor report 2 decimal places, some others just one. Now I found out on Zigbee2MQTT it’s possible to set a temperature_precision SONOFF SNZB-02D control via MQTT | Zigbee2MQTT. But I cant find a cluster in deCONZ to set this. Is this just something that z2m does internally, is the cluster/attribute missing in deCONZ?

2

I think if you see two decimal places, the second is probably 0?
Temperatures are stored in hundredths. The value stored in the device for 19°C, for example, is 1900.
So it’s possible to display hundredths.
I have Sonoff sensors that can display in 0.1° increments, but the measurement accuracy remains at 0.2°. On my Sonoff sensors, the second decimal place is always 0.
Philips Hue sensors use the second decimal place, but that doesn’t change the device’s accuracy.

image
image581×505 10.5 KB

image
image828×511 12.9 KB

3

I have multiple SONOFF Sensors. Some Report

  "state": {
    "lastupdated": "2026-02-12T11:29:04.738",
    "temperature": 2031
  }

and some

  "state": {
    "lastupdated": "2026-02-12T11:29:30.729",
    "temperature": 2010
  },

(last decimal place is always 0).

I just wonder if this is a setting I could do myself (like z2m suggests) or if this a firmware thing thats not changable

4

Good question, have searched on Z2M, nothing about zigbee stuff on code, can be just “internal cooking”, to decrease the number, but not not ask more to the device ?

Edit:

takes into effect on next report of device. This option can only decrease the precision, not increase it