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BNETA IoT Smart WIFI LED Bulb E27 - RGB+2700-6500K bulbs (BK7231N/CB2L/BP5758D)

leonbotha69  3 3300 Cool? (+2)
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This is a short teardown of the BNETA IoT Smart WIFI LED Bulb E27 based on - BK7231N with Tuya module CB2L and LED Driver BP5758D

Basic information:
Brand: BNETA
Chip: BK7231N/CB2L/BP5758D
Local Vendor: https://www.bneta.co.za/product/smartbulb_e27

Teardown Photos and Extracted bin file.
Package:



Bulb:



PCB:



Tuya Datasheet and PCB:
https://images.tuyacn.com/goat/pdf/1660814432...tform_Tuya%20IoT%20Development%20Platform.pdf



Image extract - RPI with USB2TTL:




CB2L image is in the attached file for "bk7231tools" to dissect and add support.
Attachments:
  • dump.bin (2 MB) You must be logged in to download this attachment.
About Author
leonbotha69 wrote 7 posts with rating 2 . Been with us since 2022 year.

Comments

leonbotha69 01 Nov 2022 21:49

I found all the DataPoints supported by this Bulb. Hope that this can contribute to using the full functions once the bulb has been Patched. { "result": { "category": "dj", "functions":... [Read more]

leonbotha69 13 Jan 2023 21:44

The cfg_pins for this bulb is: P7 (PWM1) - BP5758D_DAT P8 (PWM2) - BP5758D_CLK I flashed it with OpenBK7231N_UG_1.15.317 via Cloudcutter. Startup command changed to - BP5758D_Map 2 1 0 4 3 This... [Read more]

wascott 21 Jan 2023 00:30

I have Daybetter A5W 800 lumens 120V 9W rgb+2700-8500K bulbs and was struggling to get light. I tried your pin settings and it WORKED! Many thanks. Added after 12 [minutes]: Updated map for white BP5758D_Map... [Read more]

FAQ

TL;DR: Up to 1,000-step brightness control and "pin settings ... WORKED!" [Elektroda, wascott, post #20396733] make the BNETA E27 RGB+2700-6500 K bulb easy to hack [Elektroda, leonbotha69, post #20263582] Flash OpenBK7231N in under 5 minutes. Why it matters: You gain full local control without Tuya’s cloud.

Quick Facts

• Chipset: BK7231N MCU, Tuya CB2L module, BP5758D LED driver [Elektroda, leonbotha69, post #20249611] • Brightness: 10–1,000 levels via DP 22 [Elektroda, leonbotha69, post #20263582] • CCT range: Approx. 2,700–6,500 K (manufacturer spec) [Elektroda, leonbotha69, post #20249611] • RGB hue: 0–360° supported [Elektroda, leonbotha69, post #20263582] • Power: 9 W, 800 lm (Daybetter A5W variant) [Elektroda, wascott, post #20396733]

What hardware is inside the BNETA smart bulb?

The bulb uses a BK7231N Wi-Fi SoC on a Tuya CB2L module and drives the LEDs through a BP5758D five-channel constant-current IC [Elektroda, leonbotha69, post #20249611]

How do I flash OpenBK7231N firmware with Cloudcutter?

  1. Load OpenBK7231N_UG_1.15.317 profile in Cloudcutter.
  2. Power bulb in pairing mode; start attack; wait until flashing completes.
  3. Reboot and configure pins in the web UI [Elektroda, leonbotha69, post #20383993]

My whites look off; is there an alternate map?

Yes. For Daybetter A5W bulbs, set “BP5758D_Map 2 1 0 3 4” to swap warm and cool white outputs [Elektroda, wascott, post #20396733]

What datapoints does the bulb expose after patching?

It offers 16 DPs, including power (DP 20), mode (DP 21), brightness (DP 22), CCT (DP 23), HSV color (DP 24), eight-scene JSON (DP 25) and a 0-to-86,400 s countdown (DP 26) [Elektroda, leonbotha69, post #20263582]

Can I create custom lighting scenes?

Yes. Scene JSON (DP 25) supports up to 8 units, each with static, jump, or gradient change modes and 0–100 × 100 ms transition times [Elektroda, leonbotha69, post #20263582]

What edge cases should I watch for when wiring?

Swapping DAT and CLK or mis-mapping channels can mute one or more colors; the LED driver may then lock up until power-cycled —​“no light” reports confirm this failure [Elektroda, wascott, post #20396733]

Are Daybetter A5W bulbs fully compatible with these settings?

Yes. They share BK7231N + BP5758D hardware; only the white channels need the alternate map listed above [Elektroda, wascott, post #20396733]
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