Exploring Aiyato/DOIT/Cozylife Homekit 9W RGBWW E27/A60 Bulb with OpenESP32C2 Firmware {ESPC2-05]

Here's a little look at a Cozylife Homekit 9W RGBWW E27/A60 bulb. A device very similar to many others like this Corui with a BL602 based DT-BL200 module: https://www.elektroda.com/rtvforum/topic3930622.html

This bulb, like other Cozylife Homekit (non-Tuya) IoT devices is equipped with an Espressif module - the DOIT ESPC2-05 which is pin-compatible with the DT-BL200. It got a mention by @ferbulous here https://www.elektroda.com/rtvforum/topic3930622.html#20379018 as a suggested replacement for the BL200 module.

Now though, Tasmota is not the only option for ESP chips, so I'll try the OpenESP32C2 firmware.



With the two capacitors removed the module can be de-soldered using hot air.



and the VCC, GND, IO9, RX and TX soldered ready for flashing.





from TX (74880 baud) on standard boot:



with IO9 grounded



and a confirmation of the chip using esptool.exe

esptool.exe --port COm48 flash_id


then a firmware backup, attached

esptool.exe --chip esp32c2 --port COM48 --baud 115200 read_flash 0x000000 0x200000 Cozylife_A60.bin


and finally the flash to latest ESP build OpenESP32C2_1344_merge_79a69adf9fe1.factory.bin




tomorrow I'll solder it back up and find the PWM pin config for a final template. Here are some more pics of the module in the meantime

I continued.



The assignments are simply the bottom row of GPIOs



I believe the single side solder pads IO1 and RX0 are just used to hold the module in place.

Making the template





https://www.aliexpress.com/item/1005007005261284.html




https://github.com/OpenBekenIOT/webapp/pull/151

Added after 8 [minutes]:

I think it’s pretty amazing how openbeken has expanded chip support beyond beken to include esp while tasmota is well still on esp only.
I do wish we get better device group support like multiple device groups

I recently bought a similar Tuya bulb but the LN882HKI is a bare chip rather than a module. It was nice for the OEM to label all of the test pads. I'm going to try to upload the OpenBK7231N firmware when I get some spare time.

AE details:
Led RGB Light Bulb E27 Dimmable Ir Remote Control Lamp 5W 10W 15W RGBW RGBWW Led Spotlight Colorful Changing Lampada Decor Home
https://www.aliexpress.us/item/3256807214151940.html

yes. that looks to be the same bulb as here https://www.elektroda.com/rtvforum/topic4076095.html

divadiow wrote:

yes. that looks to be the same bulb as here https://www.elektroda.com/rtvforum/topic4076095.html

awesome, thanks for the link!