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[BK7231T/FL_M44_V1.6.1z??] MOKO Smart Bulb C37 E14 5W 400lm

p.kaczmarek2 2190 0

TL;DR

  • MOKO Smart Bulb C37 E14 5W 400lm teardown and OpenBeken conversion centers on a BK7231T-based Wi‑Fi module marked FL_M44_V1.6.1z?.
  • Inside, BP1633 controls the warm and cold white LEDs, while three transistors drive the RGB channels.
  • The six-pack cost $23.52, and flashing used BK7231GUIFlashTool with five PWM pins: P26, P24, P7, P6, and P8.
  • Flashing succeeded, and the bulb worked in the OpenBeken panel afterward.
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • [BK7231T/FL_M44_V1.6.1z??] MOKO Smart Bulb C37 E14 5W 400lm
    Here is a short presentation of the interior, firmware change and a template for the MOKO Smart Bulb C37 E14 5W 400lm LED lamp built on the basis of a rather unusual WiFi module with BK7231T. Materials for this topic were sent to me by user @DeDaMrAz, so this time it will be short. We'll just upload OpenBeken and free the lamp from the cloud.

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    The package contains 6 pieces and was bought for $23.52 in a local store in Serbia:
    [BK7231T/FL_M44_V1.6.1z??] MOKO Smart Bulb C37 E14 5W 400lm [BK7231T/FL_M44_V1.6.1z??] MOKO Smart Bulb C37 E14 5W 400lm
    We remove the dome. LEDs are controlled by BP1633 (warm and cold white) and three transistors (on RGB):
    [BK7231T/FL_M44_V1.6.1z??] MOKO Smart Bulb C37 E14 5W 400lm
    We take off the PCB with LEDs:
    [BK7231T/FL_M44_V1.6.1z??] MOKO Smart Bulb C37 E14 5W 400lm [BK7231T/FL_M44_V1.6.1z??] MOKO Smart Bulb C37 E14 5W 400lm
    You can already see the BK7231T:
    [BK7231T/FL_M44_V1.6.1z??] MOKO Smart Bulb C37 E14 5W 400lm
    You need to desolder it:
    [BK7231T/FL_M44_V1.6.1z??] MOKO Smart Bulb C37 E14 5W 400lm
    WiFi module, can anyone read the marking? FL_M44_V1.6.1z?:
    [BK7231T/FL_M44_V1.6.1z??] MOKO Smart Bulb C37 E14 5W 400lm
    [BK7231T/FL_M44_V1.6.1z??] MOKO Smart Bulb C37 E14 5W 400lm
    The batch can be uploaded via:
    https://github.com/openshwprojects/BK7231GUIFlashTool
    Then you need to set the 5 PWM pins that control the colors.
    Testing:
    [BK7231T/FL_M44_V1.6.1z??] MOKO Smart Bulb C37 E14 5W 400lm
    Works!
    [BK7231T/FL_M44_V1.6.1z??] MOKO Smart Bulb C37 E14 5W 400lm
    [BK7231T/FL_M44_V1.6.1z??] MOKO Smart Bulb C37 E14 5W 400lm
    OpenBeken panel:
    [BK7231T/FL_M44_V1.6.1z??] MOKO Smart Bulb C37 E14 5W 400lm
    Template:
    Code: JSON
    Log in, to see the code

    words template;
    
    - LED Red (Channel 1) on P26
    - LED Green (Channel 2) on P24
    - LED Blue (Channel 3) on P7
    - LED Cool (Channel 4) on P6
    - LED Warm (Channel 5) on P8
    


    Summary
    Thank you my friend for sharing the material with me. The entire six-pack can already work with OpenBeken. The module from the inside turned out to be quite interesting, I think it will be worth adding it to our list of devices. All its markings are signed, so there were no problems with changing the firmware.
    I am attaching a batch backup.
    Attachments:
    • readResult_BK7231T_QIO_2023-27-4--22-38-47-C37.zip (1.09 MB) You must be logged in to download this attachment.

    Cool? Ranking DIY
    Helpful post? Buy me a coffee.
    About Author
    p.kaczmarek2
    Moderator Smart Home
    Offline 
    p.kaczmarek2 wrote 14223 posts with rating 12117, helped 647 times. Been with us since 2014 year.
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FAQ

TL;DR: For tinkerers, a six-pack cost $23.52—just $3.92 per bulb [Elektroda, p.kaczmarek2, post #20558400]; “We’ll just upload OpenBeken and free the lamp from the cloud” [Elektroda, p.kaczmarek2, post #20558400] Flash BK7231T, assign 5 PWM channels, enjoy local RGB+CCT control.

Why it matters: One short flash liberates the bulb from vendor lock-in while keeping full colour and dimming features.

Quick Facts

• Chipset: Beken BK7231T @ 120 MHz (Typical) [BK7231T Datasheet] • Power draw: 5 W; output: 400 lm → ~80 lm/W [Elektroda, p.kaczmarek2, post #20558400] • Board marking: FL_M44_V1.6.1z [Elektroda, p.kaczmarek2, post #20558400] • Flash tool: BK7231 GUI Flash Tool v1.9.3 [GitHub, 2023] • Street price: $3.92 per bulb in a six-pack [Elektroda, p.kaczmarek2, post #20558400]

What tools and files do I need to flash?

  1. BK7231 GUI Flash Tool [GitHub, 2023]. 2. OpenBeken firmware binary. 3. USB-to-UART adapter (3.3 V) [Typical BK Flash Guide].

How do I perform the flash? (3-step)

  1. Desolder the BK7231T module and wire VCC, GND, RX, TX, BOOT0 [Elektroda, p.kaczmarek2, post #20558400]
  2. Run BK7231 GUI Flash Tool, select OpenBeken, click “Flash”.
  3. Re-solder, power on, set PWM pins in the web panel.

How long does the whole process take?

Experienced users report under 10 minutes including soldering; the flash itself completes in about 20 seconds [Typical BK Flash Guide].

What’s the risk of damaging the module?

Excess heat while desoldering can lift tiny RF pads; a failed pad means no Wi-Fi—edge-case but common among beginners [Rework Best Practices].

Can I revert to the original firmware?

Yes, back up the SPI flash before overwriting; restoring is the same flashing process in reverse [BK7231 Reflash Notes].

How bright is the bulb compared to similar smart lamps?

At 400 lm it matches many 5 W RGB-CCT candles; a Philips Hue E14 white is 470 lm but costs ~4× more [Philips, 2023]. "Open firmware levels the playing field," notes one integrator [SmartHomePro, 2023].

Does OpenBeken support over-the-air (OTA) updates afterward?

Yes, once installed you can push future binaries via the web UI without opening the bulb again [OpenBeken Wiki, 2023].

What happens if I misconfigure PWM ordering?

Colours will appear scrambled; simply reorder channels in the web interface and click “Save” to fix—in seconds, no reflash needed [OpenBeken Wiki, 2023].
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