[BK7231N] CoRui TUYA WiFi Smart LED Light Bulb 9W E27 RGBCW

Very nice find. I can see that even with shipping to Poland, this bulb costs only about 29 zł at the moment. It's about 6USD. It's not that much. I just hope that bulb is not overheating itself too much at the highest brightness.

Pretty expensive.
A few days ago I bought two similar ones on Allegro. Having SMART, I paid less than PLN 53 for two.
You have to be careful with these purchases on Aliexpress, because it often happens that it is cheaper on Polish portals and we have a normal VAT invoice and a guarantee in the country.

https://allegro.pl/oferta/zarowka-led-e27-9w-...mFkM2ZiOTZkMjBkYjcxMjY2NzQ3MGQ5NGJkNDcwOTg%3D

p.kaczmarek2 wrote:

Very nice find. I can see that even with shipping to Poland, this bulb costs only about 29 zł at the moment. It's about 6USD. It's not that much. I just hope that bulb is not overheating itself too much at the highest brightness.

I got one for 2usd which could be just a new store promo since it's limited to 1 unit per user.
I had some doubts at first because there was no rating or any feedback on the store but decide to give it a shot anyway.

The word "intelligent" about what kaman?
This is just a light bulb for which the topic is assumed, you do not know how to unpack, maybe let's describe shopping with a ladybug.
It shocks me, ok, something unusual for 1000zeta, but a light bulb.
The main one describes three light bulbs, the level is getting better and better.

User started a topic to provide information that:
- this particular product uses the BK7231N WiF module, so you can upload it https://github.com/openshwprojects/OpenBK7231T_App and free it from the cloud and freely script / pair it with Home Assistant or other ecosystems
- this particular product works with Tuya-cloudcutter, with the WB2L_M1 profile, so you can change the firmware without opening the case
- configuration of this product is specific pins with PWM roles (and there are 6 of them and there are 5 possible orders) and not, for example, the "I2C" driver on specific pins, so that users know how to configure

Some people buy such products and want to change their firmware, and not everyone wants to always guess the pins and check if it is possible to upload the batch remotely and whether there is BK7231 inside or, for example, something completely unsupported.

The users from Elektroda.com simply make a list of IoT devices with which the batch can be changed and document how to configure them. Here is the full list:
https://openbekeniot.github.io/webapp/devicesList.html


PS: I heard that probably such topics will get a separate section, so soon maybe "Device Interiors" will not be flooded by IoT.

CMS wrote:

A few days ago I bought two similar ones on Allegro. Having SMART, I paid less than PLN 53 for two.

If you're going to change their firmware, let them know what's inside. What WiFi module and what you uploaded.

Hola bola, i bought on AliExpress a CoRui smart bulb the same with this,BUT it seems to be from another manufacter, and tuya/smartlife app don't recognise this bulb.I could paire it only with CozyLife App.
I wanted to flash it through tuyacloudcutter but it didn't see it too.I opened it and i saw this module, BL-200, with CozyLife icon on it.Can it be flashed with OpenBeken?

@ionoleinic can you provide information where this device was bought?
Yes, this is BL602 and it's supported, but it's a very basic support, only PWM + LED drivers are implemented, because there is very few BL602 devices.
Can you give me names of ICs on the board, is this bulb using raw PWMs or an "I2C" LED driver?

I found only U1 (BP2525 - not sure if BP ,it's very hard to see) and U2 (YT5202A).I think it is using PWMs, but not sure.
Which pins are 3.3,GND,TX and RX? i can't find datasheet for BL-200 module.

Link from where it was bougth: https://www.aliexpress.com/item/1005004788058...o.order_list.order_list_main.5.30f81802F8Wdzp

Please modify your post to include screenshots from the Aliexpress offer. Aliexpress links expire after some time and then becomes inaccessible.

BP2525 is a power supply chip. It's not a LED driver.

I am unable to find any information on YT5202A.

Here's the information you requested - I had that bulb in the past, it seems.



Please look at the last photo, the pins should be described here.

Thank you very much!
You already flash it?
Which pin is for boot?
What app i should use to flash it?

Sorry, I didn't flash it yet. I must remember where I have put that bulb. I have so much disassembled devices for the sake of OBK that's it's easy to get lost. BL602 is not very popular, but here is a dedicated topic:
https://www.elektroda.com/rtvforum/topic3889041.html
If I remember correctly, the D8 is a boot pin.

For flashing, you should use BLDevCube from OpenBL602:
https://github.com/openshwprojects/OpenBL602
IMPORTANT WARNING: Buffalo labs also made a newer version of BL602 and BLDevCube which are not compatible with older version! Please use the version I specified. The one from our repo.

p.kaczmarek2 wrote:

Sorry, I didn't flash it yet. I must remember where I have put that bulb. I have so much disassembled devices for the sake of OBK that's it's easy to get lost.

How you found these photos if it was so in the past? )

p.kaczmarek2 wrote:

If I remember correctly, the D8 is a boot pin.

For flashing, you should use BLDevCube from OpenBL602:

Ok, i will try tomorrow to flash it, without desoldering of course:) .If it will fail, i will desolder it .
And what pins i should set as PWMs? How can i find them?
Thank you for help.If you will find that bulb, tell me please.

ionoleinic wrote:

p.kaczmarek2 wrote:

Sorry, I didn't flash it yet. I must remember where I have put that bulb. I have so much disassembled devices for the sake of OBK that's it's easy to get lost.

How you found these photos if it was so in the past? )

I used search function in this forum and I've found the post I made some time ago. If you use search function on Elektroda, you can find useful IoT information.

ionoleinic wrote:

And what pins i should set as PWMs? How can i find them?

Hmm considering the photos of the module, there are not many options, I think you could just get away with guessing the pins. You can see pin names on the board, there are 7 options, oh wait, 6 options, because D8 is a boot pin so it's most likely not a PWM... and you are looking for... wait, 5 pins? So it seems we've almost got them all.

How can i read a dump from module?It's possible with BLDevCube?
And it is mandatory to use 10k resistor for boot pin or no?

@ionoleinic As far as I know, there is no way to read the current flash dump, but I will admit it upright: we didn't do much BL602 research. It's a very rare platform. You can try Googling yourself if you want, but as far as I know there is not much information about Bouffalo labs chips.

I'd use a resistor, just to be on safe side. 4.7k will also be ok.

@ionoleinic thanks for the update, I’m gonna have to edit my main post again.
After some checking, the one that i had seems to be the same bulb sold by Aubess

Fyi, if you still have problems with the chip you can do a swap with espc2-05. Has the same pinout

How much is that espc2-05 module? My quick search yields 28,64zł special offer (base price 90 zł) which is not a good deal, considering that we can buy smart bulbs in Poland for about 20zł.
NOTE: 1zl = 0.23$ at the time of writing.
NOTE 2: one of many cheap bulbs in Poland - 20 zł, so basically 5$.

So if the module price is 28zł and this bulb is 20 zł (if you buy two, you get free shipping with allegro smart) then an ESP module is more expensive than whole bulb (with BK, I guess)!

EDIT: there are even better deals. 4 pieces for 65 zł, 9W, E27, so one for 16 zł, for about... 4$

@p.kaczmarek2 checking at taobao/aliexpress goes for ~ 5 - 6plz

https://a.aliexpress.com/_mMb73tg

https://item.taobao.com/item.htm?ut_sk=1.X0SK...452;接打开&app=macos_safari

Shipping is relatively cheap to malaysia but probably more expensive to poland

You have linked to the auction where module is very cheap, but seller earns with shipping.

7.46zł+15.91zł = 23.37zł
It is indeed better than what I found ( 28,64zł ) but still more expensive than buying another whole bulb.

So basically...swapping chips is not a good deal. At least in my country.

I also see that shipping cost increases with each piece (but still, it is more ecominal to buy more pieces together):

@p.kaczmarek2 i just buy from taobao because of the lower price/shipping fees (postage myr11 for 20 packs esp last time) compared to aliexpress
I haven’t done much swapping these days with openbk, that taobao shop was the go to place if i need to get esp module for cheap

HI, i tried flash bl-200 chip with OpenBl602 firmware.In Bouffalo dev cube i have this error.
Can somebody help me?


I saw that blakadder had the same prolem...

@ionoleinic if this is what you get all the time, you got most likely a newer version of BL602 which requires a whole updated SDK for that to work and is not compatible with current one...

@ionoleinic can you try settings shown by this user? Maybe he figured out something more than us.
https://www.elektroda.pl/rtvforum/topic3927070.html#20382984

p.kaczmarek2 wrote:

@ionoleinic can you try settings shown by this user? Maybe he figured out something more than us.
https://www.elektroda.pl/rtvforum/topic3927070.html#20382984

Tried.Unsuccessfully.


It seems that is flashing, but AP OpenBekenxxxxx doesn't appear...
I tried different configurations, changing partition, img, bla bla bla.... without result.

@ionoleinic but do you know that in order for AP to appear you must disconnect the boot pin and do a reboot (by RESET or by power off/on cycle)?

@ionoleinic earlier this week I flashed a bulb with BL602 chip and AP didn't appear also, I used FT232RL FTDI adapter to power the chip and disconnected boot pin but nothing happened.

What worked for me was reinstalling the chip to my bulb and powering the bulb through AC power (After fully assembling it) it showed the AP when I did that.

Maybe the FTDI adapter was not enough to power the chip.

p.kaczmarek2 wrote:

@ionoleinic but do you know that in order for AP to appear you must disconnect the boot pin and do a reboot (by RESET or by power off/on cycle)?

Yes, i know that should reboot module and disconnect boot pin.I reboot it, and not once...

Zain00 wrote:

Maybe the FTDI adapter was not enough to power the chip

I flash it with esp programmer which has enough current power to start module.

@ionoleinic so maybe take a look at the log? It's on the same UART port. What does the log output say?

I remember that i got an error when i tried to get log.