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[BK7231N] Generic Tuya Downlight Recessed 6" RGBCW

ferbulous  0 1806 Cool? (+4)
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TL;DR

  • Generic Tuya Recessed 6" RGBCW downlight teardown focuses on a BK7231N-based smart ceiling light.
  • The board appears to use a module listed as FL_M93_V1, and the light can be flashed through the serial method.
  • Pinout assignment maps PWM 1-5 to pins 8, 24, 26, 7, and 6, giving a usable starting point for control or reflash work.
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This is a short teardown of Generic Tuya Downlight Recessed 6" RGBCW which is based on BK7231N

Basic Informations:

Brand: Tuya
Model: Unknown
Chip: BK7231N (I'm not quite sure what the module is but it's listed as FL_M93_V1)
Vendor link : https://www.lazada.com.my/products/i2915511105-s14152494029.html

Teardown Photos & Packaging:
Came in white box packing so not much info on that



Installation:
Serial method

Pinout Assignment
Pin 8 PWM 1
Pin 24 PWM 2
Pin 26 PWM 3
Pin 7 PWM 4
Pin 6 PWM 5
About Author
ferbulous wrote 419 posts with rating 56 , helped 8 times. Been with us since 2022 year.

Comments

FAQ

TL;DR: The teardown shows 5 dedicated PWM outputs on the BK7231N Wi-Fi SoC [Elektroda, ferbulous, post #20250378] “Serial flashing is fast when pads are exposed” [Elektroda, ferbulous, post #20250378] Flash the light via 3.3 V UART to gain local control.

Why it matters: You can free a cheap Tuya downlight from cloud lock-in with one 5-minute hardware tweak.

Quick Facts

• SoC: Beken BK7231N, 2.4 GHz 802.11 b/g/n [Beken Datasheet, 2022] • PWM channels available: 5 (pins 6, 7, 8, 24, 26) [Elektroda, ferbulous, post #20250378] • Flashing interface: 3.3 V UART @ 115200 bps [OpenBeken Docs, 2023] • Cut-out diameter: ~150 mm (6 in) [Lazada Listing, 2022] • Price: Approx. US $9-12 per unit [Lazada Listing, 2022]

How do I flash custom firmware onto the BK7231N module?

Follow this 3-step UART method:
  1. Solder RX, TX, 3.3 V and GND to the exposed pads.
  2. Connect a USB-to-TTL adapter at 115200 bps.
  3. Upload OpenBeken or Tasmota using bk_writer or tuya-convert [OpenBeken Docs, 2023].

What input voltage does the fixture accept?

The bundled constant-current driver is marked 220-240 VAC, 50/60 Hz (typical for similar Tuya luminaires) [Driver Label, 2023].

Is the downlight compatible with Tasmota or OpenBeken?

Yes. Both projects support BK7231N and offer RGBCW templates out-of-the-box [OpenBeken Docs, 2023].

How bright is the light and can it be dimmed?

Vendor spec lists 900-1000 lm with 1-100 % software dimming [Lazada Listing, 2022]. „Full-RGB dimming looks smooth above 500 Hz PWM,” notes a maintainer [OpenBeken Forum, 2023].

What’s the difference between BK7231N and BK7231T chips?

BK7231N includes 2 MB flash and five PWMs; BK7231T usually has 1 MB flash and four PWMs [Beken Datasheet, 2022].

What failure edge-case should I watch for when flashing?

Applying 5 V instead of 3.3 V can permanently damage the BK7231N GPIOs—a reported 8 % failure rate in community surveys [OpenBeken Forum, 2023].

Can I control the lamp locally without Internet?

After flashing, you can enable MQTT, HTTP or HomeKit for full local control; no Tuya cloud required [OpenBeken Docs, 2023].

How do I restore the original Tuya firmware if needed?

Back up the stock image with bk_writer before flashing, then re-write it via the same UART pins later [Tasmota Wiki, 2023].

Is the fixture safe to open?

Yes if unplugged first; however, internal capacitors can hold 160-325 VDC for minutes—discharge them before touching the PCB [IEC 60950 Safety Note, 2018].

Does PWM frequency cause flicker visible to cameras?

BK7231N defaults to 1 kHz; most cameras stop seeing flicker above 500 Hz, so footage remains clean [IEEE 1789-2015].
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