Disassembly and Flashing Openbeken on Freshin E27 A60 RGBW WiFi Light Bulb [BK7231T, WB2L, SM2135]

Bought these from amazon.com.au
https://www.amazon.com.au/dp/B0912G5SR9?psc=1&ref=ppx_yo2ov_dt_b_product_details
https://freshin.com/products/smart-light-bulb...atible-with-alexa-google-home-no-hub-required



These bulbs seem to have rare config combining WB2L with SM2135. I had to go through quite a bit of trial and error to get the right settings but now have them working perfectly.

I disassembled the bulb and flashed openbeken following the great guides already available on this forum.
The test pads on the rear of the WB2L are visible and can be soldered to. So no need to remove the chip to flash it.



Once flashed and connected to the device, here is the configuration needed to correctly drive this bulb
Configure Module:
Pin 7 = SM2135DAT
Pin 8 = SM2135CLK

Configure Startup --> Short start up command:
SM2135_Map 2 1 0 4 3

Configure General/Flags:
10, 27

Thanks, you really got lucky with that pads access. We had bulbs where it was necessary to desolder WB2L_M1 in order to access the UART interface.
https://www.youtube.com/watch?v=2e1SUQNMrgY&ab_channel=Elektrodacom

Definitely got lucky with this one

By the way, is there a way to control the range for any of the channels?
Specifically, the brightness. The only thing I'm still trying to tinker with is that the bulb turns off when brightness is very low. Usually below 10

We have a gamma correction:
https://github.com/openshwprojects/OpenBK7231T_App/blob/main/docs/led_gamma_control.md
but your device has SM2135 driver. This driver is 8 bit per channel only and has very poor quality of color control by design. It's hardware limitation. There is nothing I can do.

SM2235 would be better, as it has 10 bits per channel:

pwm controller also would be better.