Battery low support for Bresser Explore Scientific 7 in 1 Weather Center at 868 MHz

[Tuxyso]

My display on the weather station shows "battery low" for the outdoor sensor. Any ideas how it is coded in the data? I've capture some data:

{271}768705c08bda18aa9aa9aaf9cb3eaa9c3caa8b2baaaaaaaaaa000000000000000000 {271}cdd705c08a8a18ab8ab8aaf9cb3eaa9c3caa8eadaaaaaaaaaa000000000000000000
I put the data into Bitbench.

Is it possible that the field after TEMP decoded the battery status. In previous samples it was always 0, now it is 6.

I changed the battery and the flag changed from 6 to 0. I do not know if values between 0 and 6 have and meaning, but 6 denotes ("battery low") and 0 denotes ("battery OK"). See
Bitbench

Could you add support for it?

[zuckschwerdt]

Good observation. If we use BATTERY?:4b we see that 2 bits changed. That's odd, usually the low battery flag is a single bit.
Do you have a variable power supply? That way you could drop the voltage slowly and see if truly those bits are battery state. And maybe if the two bits are a 0-3 "level".

[Tuxyso]

I have no variable power supply and the outdoor sensor is in the field thus trial&error with different AA batteries is very difficult. The batteries least about 6 month - I can check the field in 3, 4 and 5 month. Trial&error would be easier with the indoor sensor. The display of the weather station only knows "battery ok" and "battery not ok" (battery red).

[zuckschwerdt]

I'll then add all 4 bits as flags to the output. You can than watch that for some time to see if it's only 0 / 6 or also something else.