Exploring Sensylink CHT8320 Sensor from ZY-TH02Pro with OpenBeken

I wasn't that interested in getting another battery-powered TuyaMCU temp/hum sensor working with OpenBeken so decided to strip this ZY-TH02Pro down to just the sensor for use in testing. The sensor is labelled "ML DAET" alongside the Sensylink logo. Not very helpful considering other Sensylinks are usually "CHT83xx".



A kind person at Sensylink informed me it was the CHT8320. A datasheet was supplied, attached.

First, here's a quick dump of some things relating to the device as a whole for context.

SEO keywords:
Shenzhen Forever Young Excellence Technology Co., Ltd
QDO 2401 NT CJT 34013
ZY_TH02_PRO_1PCS
ZY-TH01ProCB3S V1.3

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UART boot



Tuya dpIDs



Factory CB3S firmware attached.

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With the TuyaMCU, LCD, LCD driver IC and CB3S removed the TH_SDA, TH_VDD and TH_SCL test pads can be used to give life to the CHT8320 - powered from CB3S/ESP universal adaptor 3V3:



and with



we see the sensor I2C address detected with 'scani2c soft' command


and with the CHT83XX driver set







Firmware was submitted to Cloudcutter team for profile creation https://github.com/tuya-cloudcutter/tuya-clou...erature-and-humidity-with-display-v2.1.8.json

and that's where I'm currently at. I guess the driver needs some work and I now need to permanently solder and route the 4 wires out of a case for a permanent sensor testing solution.

on the underside of the SOIC-16 TuyaMCU - "Y6". But it looks like the Y6 is stamped on top of something else. Y46D01?



Added after 1 [hours] 29 [minutes]:

soldered, rehoused in disused TH01 case, glued, labelled

not yet tested the actual sensor. Tasmota's Sensors firmware detects as

bought another TH02Pro. Bit of a journey detailed here https://github.com/RobTillaart/CHT8310/issues/5 then https://github.com/RobTillaart/CHT832X/issues/2
and to the latest development here with the new device
https://github.com/RobTillaart/CHT832X/issues/2#issuecomment-2682326789

So we need to add CHT832X to OBK? I need to order that sensor, I wonder if I'll manage to find a good deal.

AT least datasheet is here...

TLDR:
-my first stripped-down TH02Pro was too stripped and the sensor doesn't work as it is right now.
-CHT832x is an SHT30 clone so the SHT3X driver works. My second TH02Pro works with SHT3X driver



see https://www.elektroda.com/rtvforum/topic4107989.html

Added after 24 [minutes]:

p.kaczmarek2 wrote:

So we need to add CHT832X to OBK?

I guess it could be listed as supported? Would you want to change driver to reference CHT832x or just leave it untouched?

Added after 1 [minutes]:

(Weird that SHT driver doesn't do decimal values on humidity)

How did you flash this one with OpenBeken?

setum wrote:

How did you flash this one with OpenBeken?

Hi. I didn't really:

Quote:

I wasn't that interested in getting another battery-powered TuyaMCU temp/hum sensor working with OpenBeken so decided to strip this ZY-TH02Pro down to just the sensor for use in testing.

but if yours has the same firmware version you could try the cloudcutter method https://github.com/tuya-cloudcutter/tuya-cloudcutter

>>21471990

Thanks for the info. For some reason, tuya-cloudcutter didn't work for me. It got stuck midway, there are ways to recover from where I was stuck, but I wasn't successful there either.


I then tried to flash OpenBaken using BK7231Flasher. I was able to flash it successfully in place, without removing the board. Power off/on to flash is a bit tricky to do, since it takes a few seconds for power to lose (and display dims), you may have to remove GND as well. It may take a few attempts to get it right. I also had to flash at baud rate 1500000. At lower baud rate, I got the following errors: