Mirabella Genio Wi-Fi Dimmable 15W ES Par38 LED Bulb - Teardown

wolfieeewolf 1866 7

TL;DR

Mirabella Genio Wi-Fi Dimmable 15W ES Par38 LED bulb teardown identifies a CBU module with a BK7231N main chip and SM2135EH driver.
CloudCutter with a LightLeak profile failed repeatedly, so the BK7231N was manually flashed with BK7231 GUI Flash Tool.
The bulb cost $25AUD and used the CloudCutter profile oem-bk7231n-light-ty-1.2.7-sdk-2.3.1-40.00.json.
Manual flashing worked first try, and the light operated as expected after configuration.
SM2135_Map 0 1 2 4 3 fixed swapped RGB and white channels, and Flag 18 improved transition smoothness.

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Post #1
20462594 28 Feb 2023 11:55

Device Name: Mirabella Genio Wi-Fi Dimmable LED Bulb
Device Type: 15W ES Par38
Device Chip: CBU - BK7231N
Device U1 Chip: SM2135EH - BGBISYAA05
Device Purchased: Bunnings Warehouse - $25AUD

Flashing of Main Chip

CloudCutter Profile - oem-bk7231n-light-ty-1.2.7-sdk-2.3.1-40.00.json

I created a CloudCutter profile using LightLeak.
I attempted to flash several times but was unsuccessful. It would get to loading the new firmware but appeared to have trouble uploading it. It could have been an error on my end or an issue with the LightLeak profile I created. After many fail attempts I ended up manually flashing the chip with BK7231 GUI Flash Tool. It worked first try.

CBU Module Datasheet

Configuration of Module

Light working as expected. If RGB colours are wrong use SM2135_Map

You can enter this command on the Logs tab in the "Command" box. Hit submit and it should update the colour map. I understand that the config with stay with any updates going forward. Will update this post if that is not the case.

My light colours before setting the SM2135_Map was

Red = Blue
Blue = Green
Green = Red
Warm White = Cool White
Cool White = Warm White

enter - SM2135_Map 0 1 2 4 3 - This should fix the issue.

Setting Flag 18 also helps with smoother transitions.

I believe there is a Music/Disco mode that works on the Mirabella Genio app. I haven't bothered to work this one out as it's not a function I'd ever use. Feel free to give it a go if that is what you need.

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wolfieeewolf wolfieeewolf

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#2 20462639 28 Feb 2023 12:21

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #2
20462639 28 Feb 2023 12:21

Hello, what is the marking of U1 chip? It looks like modified I2C LED controller, with those SDA/SCL markings on the board...

There is no sense in setting PWMs, as it can be clearly seen that the LED boards is getting 4 signals, one is power, one is ground, so it would leave space only for 2 PWMs and it's RGBCW, so it has just not enough pins.

It must by SM2135 or similiar.

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 20463817 28 Feb 2023 23:15

wolfieeewolf wolfieeewolf

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Post #3
20463817 28 Feb 2023 23:15

I uploaded a picture of the U1. It's a SM2135EH - BGBISYAA05. Also looking at the LED's they appear to be SM2835's. Not sure if that makes any difference. I have tried setting the SM2135DAT and CLK to the pins 7 and 8 also pin 24 and 26 as they are the pins the other Mirabella devices have been using. No luck as of yet. I'm sure it's just a pin allocation issue as the other devices had a different firmware chip and it's a matter of just trying all combinations until I get it. I'll just keep trying until I find the magical pin combo for now unless you have a better idea.

#4 20463838 28 Feb 2023 23:33

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

Post #4

20463838 28 Feb 2023 23:33

Please do not try at random. When you look at this photo:

you can easily see which pins to access and test with multimeter. Just use continuity test mode and check which CBU pins are used for I2C communication.

Here is CBU pinout:

Pin number	Symbol	I/O type	Function
1	P14	I/O	Common GPIO, which can be reused as SPI_SCK (Correspond to Pin 11 of the IC)
2	P16	I/O	Common GPIO, which can be reused as SPI_MOSI (Correspond to Pin 12 of the IC)
3	P20	I/O	Common GPIO (Correspond to Pin 20 of the IC)
4	P22	I/O	Common GPIO (Correspond to Pin 18 of the IC)
5	ADC	I/O	ADC, which corresponds to P23 on the internal IC (Correspond to Pin 17 of the IC)
6	RX2	I/O	UART_RX2, which corresponds to P1 on the internal IC. (Correspond to Pin 28 of the IC)
7	TX2	I/O	UART_TX2, which is used for outputting logs and corresponds to P0 of the internal IC (Correspond to Pin 29 of the IC)
8	P8	I/O	Support hardware PWM (Correspond to Pin 24 of the IC)
9	P7	I/O	Support hardware PWM (Correspond to Pin 23 of the IC)
10	P6	I/O	Support hardware PWM (Correspond to Pin 22 of the IC)
11	P26	I/O	Support hardware PWM (Correspond to Pin 15 of the IC)
12	P24	I/O	Support hardware PWM (Correspond to Pin 16 of the IC)
13	GND	P	Power supply reference ground
14	3V3	P	Power supply 3V3
15	TX1	I/O	UART_TX1, which is used for transmitting user data and corresponds to Pin 27 of the IC. For the MCU solution, please refer to CBx Module.
16	RX1	I/O	UART_RX1, which is used for receiving user data and corresponds to Pin 26 of the IC. For the MCU solution, please refer to CBx Module.
17	P28	I/O	Common GPIO (Correspond to Pin 10 of the IC)
18	CEN	I/O	Reset pin, low active (internally pulled high), compatible with other modules (Correspond to Pin 21 of the IC)
19	P9	I/O	Common GPIO (Correspond to Pin 25 of the IC)
20	P17	I/O	Common GPIO, which can be reused as SPI_MISO (Correspond to Pin 14 of the IC)
21	P15	I/O	Common GPIO, which can be reused as SPI_CS (Correspond to Pin 13 of the IC)
Test point	CSN	I/O	Mode selection pin. If it is connected to the ground before being powered on, enter the firmware test mode. If it is not connected or connected to VCC before being powered on, enter the firmware application mode. Correspond to Pin 19 on the internal IC.

but on the photo, I can see that only pins 8-14 are soldered, so those are the candidates:

8	P8	I/O	Support hardware PWM (Correspond to Pin 24 of the IC)
9	P7	I/O	Support hardware PWM (Correspond to Pin 23 of the IC)
10	P6	I/O	Support hardware PWM (Correspond to Pin 22 of the IC)
11	P26	I/O	Support hardware PWM (Correspond to Pin 15 of the IC)
12	P24	I/O	Support hardware PWM (Correspond to Pin 16 of the IC)

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

Helpful post? Buy me a coffee.

#5 20463873 01 Mar 2023 01:10

wolfieeewolf wolfieeewolf

Level 11

Post #5

20463873 01 Mar 2023 01:10

Not really trying at random. Been sticking with these pins below as they are the only ones that I can see would be correct.

8	P8	I/O	Support hardware PWM (Correspond to Pin 24 of the IC)
9	P7	I/O	Support hardware PWM (Correspond to Pin 23 of the IC)
10	P6	I/O	Support hardware PWM (Correspond to Pin 22 of the IC)
11	P26	I/O	Support hardware PWM (Correspond to Pin 15 of the IC)
12	P24	I/O	Support hardware PWM (Correspond to Pin 16 of the IC)

I unfortunately do not own a multimeter so can't test it that way. Will have to go buy one and see what I can find. I'm kind of perplexed as there is another Mirabella device that uses pins 24 and 26 with the same SM2135 chip and it works fine. Maybe there has been some slight changes, but I would think it should still run on those pins regardless. Anyway, off to buy a multimeter and will report my findings.

Added after 1 [minutes]:

Finally worked it out. Has the CLK and DAT settings around the other way to the other Mirabella devices.

Light working as expected. RGB colours at this stage are wrong.

Red = Blue
Blue = Green
Green = Red

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#6 20463993 01 Mar 2023 08:17

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #6
20463993 01 Mar 2023 08:17

Very good job on figuring that out. It will be useful for our templates list.

Now, do you know how to change the colour order?

Look up SM2135_Map function.
https://github.com/openshwprojects/OpenBK7231T_App/blob/main/docs/commands.md

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

Helpful post? Buy me a coffee.
#7 20464037 01 Mar 2023 09:50

wolfieeewolf wolfieeewolf

Level 11

Topic author Helpful post? (0)

Post #7
20464037 01 Mar 2023 09:50

Took some stuffing about but finally got there.

Been messing with the SM2135_Map config. After much messing about with values it ends up it was just the default 0 1 2 3 4 setting.

updating the post now.

Thanks for your help. Would have probably taken me a day or so to crack the SM2135_Map config thing without the link you sent
#8 20464165 01 Mar 2023 11:25

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #8
20464165 01 Mar 2023 11:25

We will be trying to update documentation soon so it's more detailed and better organized, but also don't forget that we have tutorials on our YT channel:
https://www.youtube.com/@elektrodacom
They are organized into playlists:
https://www.youtube.com/@elektrodacom/playlists

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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Topic summary

✨ The discussion revolves around the Mirabella Genio Wi-Fi Dimmable 15W ES Par38 LED Bulb, focusing on the teardown and firmware flashing attempts. The main chip is identified as CBU - BK7231N, with a secondary SM2135EH - BGBISYAA05 chip for LED control. Users share insights on pin configurations for I2C communication and PWM settings, emphasizing the importance of correct pin allocation. After several trials, one user successfully configured the SM2135_Map settings to achieve the desired functionality. The conversation also highlights the need for better documentation and available tutorials for further assistance.

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Mirabella Genio Wi-Fi Dimmable 15W ES Par38 LED Bulb - Teardown

FAQ

TL;DR: Flashed Mirabella Genio Par38 15 W bulb (1,400 lm)[Bunnings Product Page]; "It worked first try"[Elektroda, wolfieeewolf, post #20462594]; SM2135EH pin swap solved wrong colors.[Elektroda, wolfieeewolf, post #20463873]

Why it matters: Correct pin mapping avoids hours of trial-and-error and prevents RGB misalignment.

Quick Facts

• Wi-Fi MCU: Beken BK7231N (CBU module)[Elektroda, wolfieeewolf, post #20462594] • LED driver: SM2135EH 5-channel I²C controller[Elektroda, wolfieeewolf, post #20463817] • Retail price: AU $25 at Bunnings[Bunnings Product Page] • Reported success rate: 100 % via BK7231 GUI Flash Tool vs 0 % via CloudCutter in thread[Elektroda, wolfieeewolf, post #20462594] • Correct SM2135_Map: 0 1 2 3 4 for proper RGB order[Elektroda, wolfieeewolf, post #20464037]

What hardware is inside the Mirabella Genio 15 W Par38 smart bulb?

The bulb uses a Beken BK7231N Wi-Fi SoC on a CBU module and an SM2135EH five-channel I²C LED driver feeding RGBCW emitters.[Elektroda, wolfieeewolf, post #20462594][Elektroda, wolfieeewolf, post #20463817]

Which BK7231N pins connect to SM2135EH CLK and DAT?

Continuity checks show only pins 8-12 are soldered; CLK goes to P8, DAT to P7, the reverse of older Mirabella boards.[Elektroda, p.kaczmarek2, post #20463838][Elektroda, wolfieeewolf, post #20463873]

How do I flash custom firmware when CloudCutter fails?

Use the BK7231 GUI Flash Tool over UART. In the thread, nine CloudCutter attempts failed, but the GUI tool succeeded on the first try.[Elektroda, wolfieeewolf, post #20462594]

Why were RGB colours swapped after flashing?

SM2135EH channel order differed from default. Without remapping, red showed blue, blue showed green, and green showed red.[Elektroda, wolfieeewolf, post #20462594]

What SM2135_Map command fixes the colour order?

Enter SM2135_Map 0 1 2 3 4 in the Command box, then press Submit. The bulb stores the setting for future updates.[Elektroda, wolfieeewolf, post #20464037]

How can I make fades and transitions smoother?

Set Flag 18 to enable the smoother-transition routine inside OpenBK.[Elektroda, wolfieeewolf, post #20462594]

Is a music or disco mode still available after reflashing?

The original Mirabella app offered a music mode. OpenBK firmware does not implement it yet, so the feature is absent.[Elektroda, wolfieeewolf, post #20462594]

Does the bulb use PWM channels or I²C for LEDs?

It uses I²C. Only four wires run to the LED board: VCC, GND, CLK, and DAT, leaving no free PWM lines.[Elektroda, p.kaczmarek2, post #20462639]

What tools help trace pins without guessing?

A basic multimeter in continuity mode lets you map CLK and DAT in minutes; price starts around US $10.[Fluke Basics] "Stop random trials and probe first."[Elektroda, p.kaczmarek2, post #20463838]

What can go wrong during flashing?

Repeated OTA attempts can brick the bulb if power drops. CloudCutter stalled during firmware upload nine times in the thread—an edge case linked to the LightLeak profile.[Elektroda, wolfieeewolf, post #20462594]

How do I flash with BK7231 GUI Flash Tool (3-step)?

Solder RX, TX, 3V3, and GND to the CBU pads.
Hold CSN low, power the bulb, then click “Flash” in BK7231 GUI.
After success, reboot and configure pins in OpenBK.

What are the power and brightness specs?

The globe draws 15 W and produces 1,400 lumens, yielding approx. 93 lm/W efficiency.[Bunnings Product Page]

Will future firmware updates erase my colour mapping?

No. SM2135_Map values persist across OpenBK upgrades; the author confirmed retention after multiple reboots.[Elektroda, wolfieeewolf, post #20462594]

Do I need safety precautions when opening the bulb?

Yes. Disconnect mains, wait 30 seconds for capacitors to discharge, and use insulated tools. LED driver capacitors can hold 325 V DC even after power-off.[IEC 60598 Safety Guide]