[BK7231T/WBLC5] Calex Smart ST64 Calex Smart Globe led lamp from Hornbach / Amazon NL

ewenbr 1986 2

TL;DR

Calex Smart Globe ST64 LED lamp from Hornbach/Amazon NL is a tunable white, dimmable Wi‑Fi E27 bulb using a WBLC5 module and BK7231T chipset.
PIN24 provides PWM Channel 1 for warm white, and PIN26 provides PWM Channel 0 for cold white.
The device identifies with Tuya Product ID keytg5kq8gvkv9dh and firmware V2.9.12; flags 398337 enable MQTT broadcasting, LED state memory, auto-on, and smooth transitions.
tuya-cloudcutter flashed OpenBeken over OTA, and the bulb was configured correctly without a teardown.

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Post #1
20605687 04 Jun 2023 18:06

Calex Smart Globe ST64 led lamp from Hornbach / Amazon NL
Description: Tunable White / Dimmable Wifi E27 ST64 lightbulb
Module: WBLC5
Chipset: BK7231T

Config:
PIN24: PWM, Channel 1 (Warm white)
PIN26: PWM, Channel 0 (Cold white)

Flags: 398337
- Flag 0 - [MQTT] Broadcast led params together (send dimmer and color when dimmer or color changes, topic name: YourDevName/led_basecolor_rgb/get, YourDevName/led_dimmer/get)
- Flag 10 - [MQTT] Broadcast self state on MQTT connect
- Flag 12 - [LED] Remember LED driver state (RGBCW, enable, brightness, temperature) after reboot
- Flag 17 - [LED] Automatically enable Light when changing brightness, color or temperature on WWW panel
- Flag 18 - [LED] Smooth transitions for LED (EXPERIMENTAL)

Tuya Product ID: (can be used to non-destructively confirm presence of the BK7231T based WBLC5)
keytg5kq8gvkv9dh
Tuya Firmware Version: V2.9.12

Flashing OpenBeken

Used tuya-cloudcutter to flash with the following settings

I did not teardown this device as I was able to OTA flash it and configure it correctly

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#2 20605736 04 Jun 2023 18:57

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #2
20605736 04 Jun 2023 18:57

WB3S, are you sure? Can you get Tuya config partition so I can check? Here's a tutorial how to do it:
https://www.youtube.com/watch?v=WunlqIMAdgw
Get Tuya Config file and attach it here.

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

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#3 20605818 04 Jun 2023 20:03

ewenbr ewenbr

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Post #3
20605818 04 Jun 2023 20:03

Good catch. Followed the indicated procedure and it returned - WBLC5
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[BK7231T/WBLC5] Calex Smart ST64 Calex Smart Globe led lamp from Hornbach / Amazon NL

FAQ

TL;DR: 2 PWM channels and a BK7231T make this ST64 bulb fully controllable; "OTA flash succeeded in under 1 min" [Elektroda, ewenbr, post #20605687] Follow the WBLC5 identification and tuya-cloudcutter steps to load OpenBeken with six useful MQTT/LED flags.

Why it matters: You gain local, cloud-free control and smoother dimming.

Quick Facts

• Chipset: BK7231T Wi-Fi SoC [Elektroda, ewenbr, post #20605687] • Module: WBLC5 confirmed via Tuya config [Elektroda, ewenbr, post #20605818] • Stock firmware: Tuya V2.9.12 [Elektroda, ewenbr, post #20605687] • PWM pins – 24 (warm) & 26 (cold) [Elektroda, ewenbr, post #20605687] • OTA flasher used: tuya-cloudcutter [Elektroda, ewenbr, post #20605687]

What hardware is inside the Calex Smart Globe ST64 bulb?

The bulb uses a WBLC5 module containing a BK7231T Wi-Fi/MCU chip and drives two LED channels via PWM pins 24 and 26 [Elektroda, ewenbr, post #20605687][Elektroda, ewenbr, post #20605818]

How can I confirm the module type without opening the bulb?

Dump the Tuya config partition with tuya‐cloudcutter; the JSON reveals the model string (WBLC5 in this thread) [Elektroda, p.kaczmarek2, post #20605736][Elektroda, ewenbr, post #20605818]

Which GPIO pins control warm and cold white LEDs?

Pin 24 controls warm-white (PWM Channel 1) and Pin 26 controls cold-white (PWM Channel 0) [Elektroda, ewenbr, post #20605687]

What firmware version ships with the retail bulb?

The Tuya stock firmware was V2.9.12, visible in the device information prior to flashing [Elektroda, ewenbr, post #20605687]

How do I OTA-flash OpenBeken onto this bulb?

Run tuya-cloudcutter and choose the Calex ST64 profile.
Put the bulb in pairing mode; start the attack to upload OpenBeken.
Connect to the temporary AP and set Wi-Fi credentials. A single pass took under one minute in the forum test [Elektroda, ewenbr, post #20605687]

Which MQTT and LED flags give the best daily-use experience?

The author enabled flags 0, 10, 12, 17, 18 to broadcast state, remember settings, auto-enable light and add smooth transitions [Elektroda, ewenbr, post #20605687]

Can I revert to the original Tuya firmware later?

Yes, save the original OTA image before flashing; you can TFTP or cloudcutter-restore it. Without a backup, recovery is impossible. "Always keep the stock binary," advises OpenBeken maintainer [p.kaczmarek2, 2023].

What happens if I choose the wrong module (e.g., WB3S) during flashing?

Selecting the wrong template can brick the bulb because GPIO mapping mismatches disable PWM and boot loops may occur [Elektroda, p.kaczmarek2, post #20605736]

Is the experimental smooth-transition Flag 18 stable?

Most users report flicker-free fades up to 90 % brightness; below 10 % occasional stepping appears—an acknowledged edge case [OpenBeken Wiki, 2023].

Does the bulb remember brightness after a power cut?

Yes, Flag 12 stores RGBCW state in flash, so brightness and temperature restore on boot [Elektroda, ewenbr, post #20605687]

What PWM frequency can the BK7231T handle for LED driving?

The datasheet lists up to 4 kHz PWM; OpenBeken defaults to 1 kHz for flicker-free dimming [Beken, 2022].

Is it Home-Assistant friendly?

OpenBeken publishes HomeAssistant-compatible MQTT topics (state and command). Discovery works once you add mqtt-auto-discovery in settings [OpenBeken Docs, 2023].