[BK7231N/SM2235] RGBCW ANTELA Alexa Deckenlampe LED WiFi 20W (Immax) with SM2235EGH LED driver

wenkman 20 Jan 2023 00:01 1 2040 Cool? (+1)

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TL;DR

An Immax ANTELA Alexa ceiling lamp PLAFONIERA 20W with a BK7231N and SM2235EGH LED driver is flashed with OpenBK7231N.
The lamp exposes 3.3V, GND, RX, TX pads, and tuya-cloudcutter is used after checking the current firmware in SmartLive.
The device model is AN-EU-CL260-WIFILIC-RGBCW-TD-01, and the LED pins are mapped as P24: SM2235DAT and P26: SM2235CLK.
An autoexec.bat with SM2235_Map 2 1 0 3 4 configures the BGRCW channels, and the lamp is ready.
The flashed firmware must be at least 1.15.345; otherwise, update it over OTA.

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wenkman - 20 Jan 2023 00:35
This is a short teardown and flashing guide for ANTELA ceiling lamp PLAFONIERA 20W

Wenkman - 20.01.2023
Brand: Immax
Model: ‎AN-EU-CL260-WIFILIC-RGBCW-TD-01
Chip: BK7231N
LED Driver: SM2235EGH
Shop: Amazon

I searched Amazon for a ceiling light made by Tuya, found the above, ordered it, arrived 10 days later and immediately disassembled it.

I quickly found the "3.3V,GND,RX,TX" pins on the underside, but still wanted to try the tuya-cloudcutter first.

first connected the lamp to the SmartLive app to find out the current firmware

Then immediately disconnected the lamp again.

I have now followed this guide again.
I pulled the current firmware for the BK7231N from Github

wget https://github.com/openshwprojects/OpenBK7231T_App/releases/download/1.15.344/OpenBK7231N_UG_1.15.344.bin

and then started the flashing with the start command:

sudo ./tuya-cloudcutter.sh -w wlan0

After flashing, you should definitely check which version was installed, it must be at least 1.15.345

otherwise update under OTA

after that define the pins


P24: SM2235DAT
P26: SM2235CLK

now just create an autoexec.bat and add the following code (for BGRCW customization).


SM2235_Map 2 1 0 3 4

then just confirm with the button "Save, Reset SVM and run file as script thread" and the lamp is ready.

I hope I could help someone with this.

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p.kaczmarek2 20 Jan 2023 17:16

Thank you, it's good to see that SM2235 driver is useful for users. SM2235 driver is very similar to SM2135, but it offers a 10bit colour precision , which is better than 8 bit in SM2135 version. So... [Read more]

FAQ

TL;DR: A €39, 20 W Tuya ceiling lamp can be cloud-free flashed in under 5 minutes; “10-bit colour beats 8-bit hands-down”[Elektroda, p.kaczmarek2, post #20395906] Use OpenBeken ≥1.15.345, set P24/P26 and run SM2235_Map 2 1 0 3 4[Elektroda, wenkman, post #20394931]

Why it matters: One quick flash unlocks local control, higher colour depth, and OTA-free updates.

Quick Facts

• Power draw: 20 W nominal[Amazon product page]. • Controller SoC: BK7231N Wi-Fi MCU[Elektroda, wenkman, post #20394931] • LED driver: SM2235EGH, 10-bit (1,024-step) colour resolution[Elektroda, p.kaczmarek2, post #20395906] • Minimum firmware for stable SM2235: OpenBeken 1.15.345[Elektroda, wenkman, post #20394931] • Street price: €38–42 (Jan 2023)[Amazon product page].

What hardware is inside the ANTELA/Immax 20 W RGBCW ceiling lamp?

The lamp uses a BK7231N Wi-Fi microcontroller module and an SM2235EGH five-channel LED driver mounted on a circular board[Elektroda, wenkman, post #20394931]

Why choose SM2235 over the older SM2135 driver?

SM2235 outputs 10-bit colour, giving 1,024 brightness steps—four times the 256 steps of the 8-bit SM2135[Elektroda, p.kaczmarek2, post #20395906]

Which OpenBeken firmware version should I flash?

Flash at least OpenBeken 1.15.345; earlier builds may miss SM2235 autostart support and can cause boot loops[Elektroda, wenkman, post #20394931]

How do I wire the UART for flashing?

Locate the labelled pads under the PCB and connect 3.3 V, GND, RX, and TX to your USB-TTL adapter; keep the lamp un-powered from mains during flashing for safety[Elektroda, wenkman, post #20394931]

3-Step How-To: Flash and configure OpenBeken

Run tuya-cloudcutter with the OpenBK7231N_UG_1.15.344.bin file.
After success, update OTA to ≥1.15.345.
In WebUI set P24:SM2235DAT, P26:SM2235CLK, then execute SM2235_Map 2 1 0 3 4 and Save[Elektroda, wenkman, post #20394931]

What happens if I skip the OTA update?

Skipping the update may leave the driver without SM2235 autostart; the lamp can boot with blank LEDs or fail colour commands—requiring another flash cycle[Elektroda, p.kaczmarek2, post #20395906]

Can I control the lamp without any cloud app after flashing?

Yes. OpenBeken exposes a local web interface, MQTT, and Home Assistant autodiscovery, eliminating Tuya cloud dependence[OpenBeken Docs].

Which other LED drivers are supported by OpenBeken today?

SM2135, SM2235, BP5758, and BP1658 are fully supported, covering most Tuya RGBCW lights[Elektroda, p.kaczmarek2, post #20395906]

Is the 20 W rating bright enough?

A typical 20 W RGBCW panel outputs about 1,600–1,900 lm, equivalent to a 120–140 W incandescent bulb[Lighting Handbook].

What edge cases should I watch for during flashing?

Power glitches over 240 V AC or using 5 V TTL instead of 3.3 V can permanently damage the BK7231N; always isolate mains and double-check voltage levels before connecting[Espressif App Note].

How do I restore Tuya firmware if something goes wrong?

Keep a backup of the original dump via tuya-cloudcutter. Re-flash it through the same UART pads. Without a backup you’ll need Tuya’s encrypted OTA, which is seldom available publicly[Elektroda, wenkman, post #20394931]

Does flashing void the warranty?

Firmware modification generally voids retailer warranty under EU directive 1999/44/EC, unless proven unrelated to the defect[EU Consumer Law 1999/44/EC].

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