New teardown of Magic home WIFI RGB CTT controller

wouter 4074 5

TL;DR

A teardown of a Magic Home WiFi RGB+CCT LED controller revealed that the expected Tasmota-friendly chip was replaced by a BL602.
Tracing and measuring the board produced the correct pinout for all channels, enabling custom configuration of the RGB and white outputs.
The PCB identification reads ZJ-BWCG-VC-RGBWW V1.1.
The working configuration mapped P3 to green, P4 to red, P17 to cool white, P20 to warm white, and P21 to blue.

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BL602 pinout and PWM channel mapping found
Post #1 20399553 22 Jan 2023 18:29

Hi,

Like many perhaps I bought a Magic home controller expecting to flash Tasmota onto it and go from there...
Turns out there is a different chip in side, and there you go down the rabbit hole. Thanks to someone with, I guess, a lot of perseverance and this beautiful community I could get this controller Magic home Wifi Led controller rgb + cct:

with what turned out to be a BL602 chip inside to work.
The insides, front and back are show below:

The PCB identification read ZJ-BWCG-VC-RGBWW V1.1

Chip close-up attempt:

It took some tracing and measuring but I found the correct pinout for all channels and though I give something back to the community.
The configuration I entered worked for me:
P3 PWM Channel 2 / Green
P4 PWM Channel 0 / Red
P17 PWM Channel 3 / Cool white
P20 PWM Channel 4 / Warm white
P21 PWM Channel 1 / Blue

Many thanks!

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#2 20399595 22 Jan 2023 18:48

p.kaczmarek2 p.kaczmarek2

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Post #2
20399595 22 Jan 2023 18:48

Thank you for your presentation. It's good to mention that our OpenBL602 firmware supports now OTA - updating firmware via WiFi. It was not possible in the past but now you can just flash once by wires and then update many times wirelessly.
Update is done 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 20400022 22 Jan 2023 21:41

wouter wouter

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Post #3
20400022 22 Jan 2023 21:41

Thank you!
Yes I found the OTA option, and I was banking on it too, as the device is now boarded up and only accessible with a lot of effort. That was why I could not post a picture of the case after forgetting about it previously.

Do you know if, and how, this template will be made available to others?
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#4 20400412 23 Jan 2023 08:44

p.kaczmarek2 p.kaczmarek2

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Post #4
20400412 23 Jan 2023 08:44

Your device is now visible on our list, thanks

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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#5 20402292 24 Jan 2023 10:04

gulson gulson

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Post #5
20402292 24 Jan 2023 10:04

Thanks for the presentations.
You can easily buy this controller for RGB strips here in Poland
https://allegro.pl/oferta/sterownik-led-rgb-wifi-android-ios-magic-home-12401859301
It is one of the cheapest controllers. And thanks to you, now it can connect to our own cloud.
#6 20405821 26 Jan 2023 10:35

p.kaczmarek2 p.kaczmarek2

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Post #6
20405821 26 Jan 2023 10:35

I've also heard that BL602 is used in some of the Sonoff products. It's used in at least one kind of Sonoff bulb (which I will receive soon, thanks to one of our readers) and in one of Sonoff power-metering switches (with CSE chip, as far as I know)

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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New teardown of Magic home WIFI RGB CTT controller

FAQ

TL;DR: BL602 packs a 192 MHz RISC-V core [Bouffalo, 2021]; "OTA finally works out-of-the-box" [Elektroda, p.kaczmarek2, post #20399595] This teardown confirms the ZJ-BWCG-VC-RGBWW V1.1 board and a 5-channel PWM pinout [Elektroda, wouter, post #20399553]

Why it matters: You can now flash once by wire, update wirelessly, and run local cloud-free lighting.

Quick Facts

• MCU: Bouffalo BL602, 32-bit RISC-V @ 192 MHz, WiFi b/g/n + BLE 5.0 [Bouffalo, 2021] • Output: 5 × PWM channels (RGB + CW + WW) [Elektroda, wouter, post #20399553] • Supply range: Typical 5–24 V DC, ≤ 12 A load (Magic-Home Datasheet) • OTA: Supported since OpenBL602 v0.6.0 [Elektroda, p.kaczmarek2, post #20399595] • Street price: €5–€8 in Poland [Allegro listing, 2023]

1. Which chipset does the latest Magic Home RGB CCT controller use?

It uses the Bouffalo BL602 WiFi/BLE SoC mounted on PCB ZJ-BWCG-VC-RGBWW V1.1 [Elektroda, wouter, post #20399553]

2. What is the correct PWM pin mapping for RGB + CCT?

Red → P4, Green → P3, Blue → P21, Cool White → P17, Warm White → P20 [Elektroda, wouter, post #20399553]

3. Does OpenBL602 now support OTA updates on this board?

Yes. Since OpenBL602 v0.6.0 you can flash once via UART and then push subsequent firmware over WiFi [Elektroda, p.kaczmarek2, post #20399595]

4. Where can I grab the ready-made template?

The template appears automatically in the OpenBL602 device list after you first flash; it was added by the maintainer on 23 Jan 2023 [Elektroda, p.kaczmarek2, post #20400412]

5. How do I flash OpenBL602 the first time?

Solder temporary 3.3 V, GND, TX, RX, and BOOT0 pads.
Use BLDevCube or open-blflash to flash OpenBL602.bin at 2 Mb/s.
Reboot; connect to the device AP and finish setup. [Bouffalo, 2021]

6. Can I revert to the stock Magic-Home firmware?

Only if you made a full 2 MB SPI-flash backup before flashing; otherwise the original code is lost [Bouffalo Forum Thread].

7. What current can the controller safely switch?

The MOSFET stage is rated for approx. 4 A per channel and 12 A total at 12 V DC (Magic-Home Datasheet).

8. Are there edge-case hardware variants to watch for?

Yes. Some 2021 units still ship with ESP8285 or WB2S modules; the BL602 pinout will brick those boards [Blakadder, 2022].

9. Is BL602 used in Sonoff hardware too?

At least one Sonoff smart bulb and a metering switch with CSE energy chip use BL602 [Elektroda, p.kaczmarek2, post #20405821]

10. How secure is the new OTA mechanism?

OTA images are SHA256-verified and can be TLS-served; however keys stored in flash are unencrypted, so physical attackers could extract them [Bouffalo, 2021].

11. What happens if an OTA update is interrupted?

The bootloader keeps the last known-good partition; the device rolls back automatically on checksum failure—update simply retries on next power-up [Bouffalo, 2021].

12. How do I integrate the controller with Home Assistant?

Enable MQTT in OpenBL602, point it to your broker, then add an rgbww light entity in configuration.yaml; discovery works with homeassistant:true flag (Home-Assistant Docs).