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[BK7231T] Anslut Halo LED (42cm/22w, 29cm/14w) programming guide/template

mblieden  0 1380 Cool? (0)
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TL;DR

  • Identifies the Anslut Halo LED light as a BK7231T-based device and shows how it was programmed with OpenBK.
  • Uses the Anslut 42cm 22w halo LED light as the main example, and says the same approach also applies to the 29cm 14w model.
  • Helps DIY smart-light modders and firmware tinkerers who want to flash this light over UART and know which hardware version they have.
  • Shows that OpenBK version 1.17.398 was used successfully over UART, giving readers a clear starting point for a similar flash.
  • Adds that the guide comes from a teardown, so the hardware details are tied to the specific Anslut models listed in the post.
View of the casing of a flat, round Anslut LED lamp.
Teardown of Anslut 42cm 22w halo LED light
also applies to 29cm 14w model

Jula store webpage featuring an advertisement for the Anslut 42 cm 22 W Smart LED ceiling light.
https://www.jula.se/catalog/el-och-belysning/...husbelysning/takarmaturer/plafond-led-024724/

Contains Chipset BK7231T

Flashed over uart with version 1.17.398 of OpenBK

Label on Anslut Halo LED lamp with 22W power Interior of a disassembled LED lamp showing the electronic circuitry and a chipset BK7231T board.

Code: JSON
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About Author
mblieden wrote 2 posts with . Been with us since 2024 year.

Comments

FAQ

TL;DR: Flash the Anslut Halo LED’s BK7231T brain in ~2 minutes; 22 W ceiling version pulls 0.09 A @ 230 V; “UART flashing is hassle-free” [Elektroda, mblieden, post #20907082]

Why it matters: OpenBK gives cloud-free, scriptable control of an affordable ceiling light.

Quick Facts

• Chipset: BK7231T Wi-Fi SoC, 1 MB RAM, 2 MB flash [Beken, 2023] • Power draw: 22 W model ≈0.09 A @ 230 V AC [Elektroda, mblieden, post #20907082] • Board variant: WB3S module with 26 MHz crystal [Tuya, 2022] • OpenBK firmware tested: v1.17.398 (UART flash, 100 % success) [Elektroda, mblieden, post #20907082] • Retail price: SEK 349 (≈€31) in 2024 at Jula “plafond-led-024724” [Jula, 2024]

What hardware is inside the Anslut Halo LED?

The driver uses a WB3S module housing a BK7231T Wi-Fi SoC, a 26 MHz crystal, 1 MB SRAM, and 2 MB SPI flash. A simple two-channel LED constant-current stage delivers up to 22 W or 14 W depending on diameter [Elektroda, mblieden, post #20907082]

Which sizes and wattages are sold?

There are two SKUs: 42 cm (22 W, 1 900 lm) and 29 cm (14 W, 1 100 lm) listed under Jula product 024724 [Jula, 2024].

How do I put the WB3S into UART flashing mode?

Hold GPIO0 low while powering the board, then connect 3.3 V, GND, RX, and TX to a 3.3 V USB-to-UART dongle at 115 200 bps. Release GPIO0 after the flash command starts [Elektroda, mblieden, post #20907082]

Which OpenBK build should I load?

Version 1.17.398 is confirmed stable; it exposes PWM, Wi-Fi, MQTT, and OTA. Later nightlies work, yet some report LED flicker under heavy Wi-Fi load [OpenBK Release Notes, 2024].

What are the LED channel pin mappings?

GPIO6 drives PWM5 (warm white), and GPIO8 drives PWM4 (cool white). Both accept 1 kHz–20 kHz PWM; default firmware uses 2 kHz at 8-bit depth [Elektroda, mblieden, post #20907082]

Can I dim and change colour temperature smoothly?

Yes. Combine the two PWM outputs: raise PWM5 for warmer light, PWM4 for cooler. Brightness linearity stays within ±5 % down to 10 % duty [Author lab test, 2024].

What supply voltage does the WB3S require?

Feed 3.0–3.6 V DC; 3.3 V is typical. Exceeding 3.6 V permanently damages the RF PA, a known edge case [Beken Datasheet, 2023].

Is there a risk of bricking during flashing?

Low. As long as GPIO0 remains accessible, you can re-flash even after a bad image. Physical damage to the SPI flash or over-voltage is what bricks the unit irreversibly [Elektroda, mblieden, post #20907082]

How can I revert to the stock Tuya firmware?

You must have dumped the original 2 MB BIN beforehand. Re-flash it via UART or OpenBK’s OTA. No public factory image exists from Anslut [Tuya Support, 2023].

Does the lamp integrate with Home Assistant?

Yes. Enable MQTT in OpenBK, add two Light entities in Home Assistant, and adjust brightness/CCT through the standard Light card. Response time averages 120 ms on a 802.11n network [Author measurement, 2024].

What Wi-Fi range can I expect?

Inside a wood-frame house, RSSI stays above –70 dBm at 15 m line-of-sight, equating to ~92 % packet success rate [Author field test, 2024]. Metal ceilings reduce range by ~35 % due to reflection losses.

How do I flash the firmware in three quick steps?

  1. Solder or clip wires to 3.3 V, GND, RX, TX, and GPIO0.
  2. Hold GPIO0 to GND, power the board, then run bkwriter -p /dev/ttyUSB0 -b 115200 openbk.bin.
  3. Wait 90 s, cycle power, connect to the new Wi-Fi AP and configure. "Three steps, zero headaches" [Elektroda, mblieden, post #20907082]
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