LN8825B Flashdump Resources, UART Pinout, and OTA Web App for Lightning Semi LN8825

A new thread for Lightning Semiconductor (上海亮牛半导体科技有限公司 (Shanghai Liangniu Semiconductor / “亮牛半导体”)) LN8825 development.

@insmod first revealed evidence of development here https://www.elektroda.com/rtvforum/topic4147664-150.html#21804979 then later OpenLN8825 PR appeared https://github.com/openshwprojects/OpenBK7231T_App/pull/1946

LN8825B previously seen :
https://www.elektroda.com/rtvforum/topic4023264.html
https://www.elektroda.com/rtvforum/topic4089301.html
Current Flashdumps :
https://github.com/openshwprojects/FlashDumps/tree/main/IoT/LN8825B



Quick ref:

A10 grounded at power-on - download mode
Flash program B8 - U0RXD, B9 - U0TXD

B6 - U1RX, B7 - U1TX





Added after 7 [minutes]:

for LN8825 ota in web app https://github.com/OpenBekenIOT/webapp/pull/256

OpenLN8825 boot log


Added after 2 [hours] 4 [minutes]:

omg. one of the 3 LN8825B Tuya RGB controllers I've owned over the last 2 years IS still viable. I thought I'd killed them all





Added after 9 [hours] 29 [minutes]:

soldered and cleaned back up ready for PWM test. need to go out for a bit. coloured cables didn't match PCB marking from factory, so kept that.

OTA 1946_merge_8775a20909f8 -> 1946_merge_07e9bff1fbb6 ✅



looks like IR has resistors and capacitor too so could try that out. could bridge resistors on CW and WW too I guess for other IO use

Added after 3 [hours] 10 [minutes]:

well, LLM was correct with these IOs being in use on this device (not from KV extraction). With my 3-pin strip I immediately get R, G and B to match:

R=A11, G=A8, B=A7

but only if I use GPIO dr to pull each high. As PWM the colours don't change much, even with LED tools. Power on/off button is not effective - the colours change a little instead.



Added after 11 [hours] 1 [minutes]:

1946_merge_07e9bff1fbb6 -> 1946_merge_4e2cdfd460bc ✅

PWM looks good now! dimmer too


Added after 5 [minutes]:

getting something - A9

I think LN pr can be merged.
IR recv works fine.
IR send seems to work fine (esphome IR receives what i sent), but i doubt that anyone would be using it.

There's also LN882H SDK update (the only important thing is wifi lib, 1.5.0->1.6.0).
Plus i added sockets count and idle hook.
https://github.com/openshwprojects/OpenLN882H/pull/22
Shall i merge it into LN8825 pr, or do it in separate one?
I tested it, and nothing is broken.

insmod wrote:

There's also LN882H SDK update (the only important thing is wifi lib, 1.5.0->1.6.0).

very nice

divadiow wrote:

looks like IR has resistors and capacitor too so could try that out.

of course it does. it shipped with IR 🤓

Just a notice for the future - cloudcutter won't be supported, because partition layout is different (and .ld subsequently)

LN8825B OTA listing



OTA to release worked