New device Ecowitt water sensor, PN WN34D

[Mart124]

Hello,

Ecowitt does a water temperature sensor, PN WN34D, user manual.

Here are then some samples from it : WN34D.zip

g001_868.34M_250k.cu8 : 20.3°C
g001_868.34M_1000k.cu8 : 25.7°C
g002_868.34M_250k.cu8 : -4.9°C
g002_868.34M_1000k.cu8 : -9.0°C

It is decoded by protocol 221, but with a 40°C offset for positive values, and another one for negative values...

Could we have a look to properly support it please ?

Thank you very much 👍

[Mart124]

@anthyz flagging you here, as you worked on WN34L/S in #2122 :)
@ProfBoc75 also notifying you as you worked on many devices recently :)
Thank you again, and of course, feel free if needed 👍

[ProfBoc75]

Hi @Mart124:

Yes, there is a gap at the data layout for the Temp.

The current decoder could be updated accordingly.

Current data layout:

TYPE 8h ID 24h NOT_USED 5h TEMP_RAW 11s  NOT_USED 1b BAT 7d CRC 8h CHECKSUM 8h TRAIL_BYTE 12h 2x

New one:

TYPE 8h ID 24h SUB_TYPE 4h TEMP_RAW 12s  NOT_USED 1b BAT 7d CRC 8h CHECKSUM 8h TRAIL_BYTE 12h 2x

If SUB_TYPE = 0   = WN34L, Current decoder, temp = (Temp_raw - 400) * 0.1f
If SUB_TYPE = 0x4 = WN34D, No Temp offset , temp = Temp_raw * 0.1f

Here the bitbench

[ProfBoc75]

I want to confirm my assumption, can someone confirm the sub_type approach as we don't have lot of samples to replay.

[Mart124]

Hi @ProfBoc75

First, thank you very much for the debug, and for the PR ! Really glad :)
Also glad to see that it does not require a full new decoder, but an update only.

I want to confirm my assumption, can someone confirm the sub_type approach as we don't have lot of samples to replay.

Do you want some more samples from the WN34D variant ? Or from the WN34L / WN34S ones ?
I only have the D here...

Thank you again 👍

[ProfBoc75]

Hi @Mart124 :

Just try with -R 221:v and report few codes : {72}xxxx... results, please, it's enough for me.

like this: (from WN34L samples at rtl_433_tests)

{72}34003bcd021d446a09
{72}34003bcd028c44d3e1
{72}34003bcd03e84443ae
{72}34003bcd02ad44fb2a

or WN34D: (your CU8 files)

{72}340064d341014f9793
{72}340064d340cb4f955a
{72}340064d34fa64f31e0
{72}340064d34fcf4fa77f

[Mart124]

Here are some codes from WN34D, but without your PR (I was not able to find a compiled version from the CI, not sure it does) :

codes     : {72}340064d3411b4f172d
value : 28.3

codes     : {72}340064d340e14fa782
value : 22.5

codes     : {72}340064d340dc4f552b
value : 22

codes     : {72}340064d340d74f4f20
value : 21.5

codes     : {72}340064d340d24f3804
value : 21

codes     : {72}340064d340ce4fe2aa
value : 20.6

Hope this is what you are looking for, of course feel free if needed 👍

[ProfBoc75]

bitbench with your last codes, sounds good, Thx.