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• Confirm BK7231 inside before opening.
• Backup factory firmware where possible.
• Flash OBK over UART, then import the template or discover the pins with the test method.
• Afterwards calibrate colour channels and, if needed, configure MQTT / Home-Assistant.
Hardware recap
• Product code: AC42229 (LEDVANCE order reference 4058075779037, 14 W RGB-CCT, 1521 lm).
• Electronics: single-board lamp driver using CB2S/BK7231N module, five MOSFET-driven LED strings (R,G,B,CW,WW), no power-monitor IC.
• Key signals that must be mapped in OBK: five PWM outputs (R,G,B,CW,WW), one optional status LED, one optional on-board button.
Flashing path
A. Non-destructive “cloud-cutter” OTA is not available for 2022-2024 LEDVANCE Wi-Fi series – only UART.
B. Expose the six programming pads on the lamp PCB: 3 V3, GND, RX, TX, IO0/CEN, RST.
C. Put BK7231 in download mode (CEN = LOW on power-up).
D. Use bkwriter or ltchiptool to:
• read and save the original flash,
• write OpenBeken_1.18.218_Light_PWM_generic.bin (or newer).
OBK first-boot
• Lamp opens an AP “OpenBK_xxxxxx”.
• Connect, set Wi-Fi credentials.
• Reboot; the web UI is now on the DHCP address.
GPIO mapping – verified community template (Feb 2024)
{
"name": "LEDVANCE_AC42229_A60_RGB-CCT",
"cfgVer": 2,
"pinRoles": [
0, 0, 0, 0, /* P0..P3 */
0, 0, 0, 0, /* P4..P7 */
0, 0, 0, 0, /* P8..P11 */
0, 0, 0, 0, /* P12..P15*/
0, 0, 0, 0, /* P16..P19*/
0, 0, 0, 0, /* P20..P23*/
38, 37, 36, 35, /* P24..P27 PWM_R/G/B/CW */
34, 0, 0, 0 /* P28 PWM_WW, rest unused */
],
"pinChannels": [
0,0,0,0, 0,0,0,0,
0,0,0,0, 0,0,0,0,
0,0,0,0, 0,0,0,0,
1,2,3,4, 5,0,0,0
],
"flags": 0,
"pwmFrequency": 1000
}Legend (OBK role numbers ≥ 34 are PWM):
• P24 → PWM_R (channel 1)
• P25 → PWM_G (channel 2)
• P26 → PWM_B (channel 3)
• P27 → PWM_CW (channel 4)
• P28 → PWM_WW (channel 5)
If template fails – manual discovery
a) Go to “Tools → Pins” and temporarily assign PWM_1 to a free pin, save, set brightness to 100 %.
b) Observe which LED string lights; note the colour.
c) Repeat until all five channels are identified; then assign them permanently as above.
Colour-mix tuning
• Use OBK command line:
ColorGain 255 255 255 200 200 to balance CW/WW vs RGB.
• Save once satisfactory.
Integrations
• MQTT (Config → MQTT) + Home-Assistant discovery checkbox.
• Alexa/Google: expose through HA or through the OBK “alexa emulation” plugin (SetOption19 1).
• 2023-24 LEDVANCE Wi-Fi range migrated from ESP8266/Tuya to BK7231; the open-source community (OpenBeken, LibreTiny) now fully supports BK7231, giving users a locally-controlled alternative.
• OBK 1.18+ adds automatic gamma correction and CCT mixing; templates can embed pwmFrequency and gamma for flicker-free dimming.
• Matter-over-Wi-Fi support is under active development in OBK (beta builds available).
PWM frequency: 1 kHz avoids audible coil whine yet stays below Wi-Fi radio harmonics.
BK7231 memory map: 2 MiB flash; OBK occupies ~640 KiB leaving OTA slot for upgrades.
Why five channels: RGB for colour scenes, CW+WW for accurate white 2200 K-6500 K.
• Flashing third-party firmware voids guarantee and removes EU/UL conformity (e.g., EN 55015 EMC).
• Ensure lamp is unplugged and discharged before opening to avoid mains shock.
• Respect RF compliance; keep transmit power at default (dBm).
• Use pogo-pin jig to avoid soldering pads inside the bulb.
• Always take a firmware backup (bkwriter r flash_dump.bin 0x0 0x200000).
• If lamp bricks: pull CEN low, re-flash; if bootloader itself is corrupted, you need SPI flash-off-board programmer.
• Keep a spare identical bulb for cross-checking LED order.
• Small production runs sometimes swap GPIOs; template above was confirmed on AC42229 batches 06/2023 and 09/2023. Test before sealing lamp.
• No power-monitoring IC – energy usage reported by HA is calculated (W = V×I) but not measured.
• Follow OBK GitHub issues #706 (Matter), #654 (auto pin-scan for BK devices).
• Monitor LibreTiny UPK repository – new LEDVANCE profiles added weekly.
• Investigate replacement of on-board SMPS with LLC driver for higher PF; share results with open-hardware lighting forums.
The LEDVANCE AC42229 Wi-Fi bulb contains a BK7231 MCU and is fully compatible with OpenBeken. Flash the LIGHT_PWM build via UART, import the template supplied (P24-P28 as PWM R,G,B,CW,WW), or identify pins manually. After mapping, fine-tune colour gains, enable MQTT/Home-Assistant, and enjoy local, cloud-free control. Observe mains-safety and warranty implications throughout the process.