Device Support - Ecowitt WS85 about rtl_433 HOT 2 OPEN

Hi @Vertikar:

My findings:

 0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
YY II II II BB 55 66 77 88 99 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 ZZ XX AA 00 00 00 ...
85 00 2b 22 a1 81 e6 00 00 00 3f ff 30 00 14 00 00 63 08 00 90 77 ae 00 01 6b 68 50 00 00 00 00
85 00 2b 22 a1 81 e6 00 00 00 3f ff 30 00 14 00 00 63 08 00 90 67 ae 00 01 6b 14 ec 00 00 00 00 0
85 00 2b 22 9e a2 03 00 03 09 3f ff d4 cc 82 02 26 5e 6f 57 8c 17 d2 fa 00 6b d0 77 00 00 00 00 0

• BB Position 4 looks like battery level, slowly decreasing 0xa1 (=161 x 0.02 V = 3.22 V), 0xa0, 0x9f, 0x9e, 0x9a (=3.08 V), aligned with 2xAA, starting around 3.2 V with brand new batteries (2*1.6 V) .

• ZZ Position 25 is firmware version, 0x6b = 107 = version 1.0.7 , the version 1.0.8 is available on the ecowitt web site.

• XX Position 26, this is the CRC-8, crc8(b, 26, 0x31, 0x00) as others Fine Offset but before the checksum

• AA Position 27, this is the checksum, add_bytes(b,27), so CRC & CHECKSUM position have been swapped compare to other Fine Offset/Ecowitt sensors WS80/WS90.

The WS85 doesn't report UV Index nor LUX, only the Rainfall, Wind speed and Wind direction, and probably Wind Gust.

The other values, you must play with a cloth to put over the sensor to stop any wind in order to identify the wind byte position. Depends how you will put the cloth, you can let 2 openings (in/out) to force wind direction and then identify the wind direction byte(s) and bytes position. And step by step you should be able to find the data layout.

Waiting for your gateway to confirm that.

from rtl_433.

Great, thanks for your help @ProfBoc75! Will do some further testing as you suggested once I've got the gateway.

from rtl_433.