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

wenkman 2037 1

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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📢 Listen (AI):
  • wenkman - 20 Jan 2023 00:35
    This is a short teardown and flashing guide for ANTELA ceiling lamp PLAFONIERA 20W
    [BK7231N/SM2235] RGBCW ANTELA Alexa Deckenlampe LED WiFi 20W (Immax) with SM2235EGH LED driver
    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.

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

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

    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

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

    After flashing, you should definitely check which version was installed, it must be at least 1.15.345
    [BK7231N/SM2235] RGBCW ANTELA Alexa Deckenlampe LED WiFi 20W (Immax) with SM2235EGH LED driver
    otherwise update under OTA

    after that define the pins
    
    P24: SM2235DAT
    P26: SM2235CLK
    

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

    now just create an autoexec.bat and add the following code (for BGRCW customization).
    
    SM2235_Map 2 1 0 3 4
    

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

    Cool? Ranking DIY
    About Author
    wenkman
    Level 2  
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    wenkman wrote 4 posts with rating 4. Been with us since 2023 year.
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  • #2 20395906
    p.kaczmarek2
    Moderator Smart Home
    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 we already support SM2135, SM2235, BP5758 and BP1658 - are there any more drivers needed?

    Btw, the SM2235 autostart was resolved/added, it should work in further updates.
    Helpful post? Buy me a coffee.
📢 Listen (AI):

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]

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

  1. Run tuya-cloudcutter with the OpenBK7231N_UG_1.15.344.bin file.
  2. After success, update OTA to ≥1.15.345.
  3. 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].

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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