OpenBeken BK7231N SM2135: Enabling Smooth Dimming and Fading Transitions

Hello,

I am trying to configure smooth dimming / fading effects on my OpenBeken-flashed LED controller, but I cannot get any transition behavior to work.

Device information:
Chipset: BK7231N
Firmware: Built on Feb 13 2026 – Version 1.18.261
LED driver: SM2135 (confirmed active in web UI)
5-channel RGBCW controller
The device is correctly detected and running in Light mode.

The web UI shows:
Brightness slider
RGB color control
Temperature slider
“1 drivers active (SM2135) total 32"

So the light driver itself appears to be working correctly.

What I am trying to achieve
would like behavior similar to Tasmota, where I can enable smooth fading directly in the firmware:



This causes the device to interpolate brightness changes internally (device-side), independent of Home Assistant.

Tasmota-Docs: Fade

What I tested:


I cannot find any documented commands like:
fade
transition
smooth or
setChannelTransitionTime
OpenBK7231T_App-Docs

I am looking for:
Device-side brightness interpolation
Device-side color interpolation
Smooth transitions directly in the driver
Essentially the equivalent of Tasmota’s Fade Speed, but for OpenBeken.

Is smooth dimming / fading currently supported for:
BK7231N
SM2135 driver
Firmware 1.18.261

If yes:
What is the correct command?
Is additional configuration required?
Is led_lerpSpeed supposed to handle this?

If not:
Is this feature planned?

thank you very much!

Have you tried to set the related flag?
https://github.com/openshwprojects/OpenBK7231T_App/blob/main/docs/flags.md