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[BL602] [SM2135] Surplife APP RGB+WW+CW bulb

Zain00 8499 22
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  • This a $5.2 bulb I got from Amazon.sa
    Unfortunately, this bulb seems to be a no name brand but it does use the Surplife APP. Sorry I don't have further information about it.

    [BL602] [SM2135] Surplife APP RGB+WW+CW bulb [BL602] [SM2135] Surplife APP RGB+WW+CW bulb

    I was hoping to get BK7231T or BK7231N just so I can try Tuya Cloudcutter but this bulb came with a BL602 module BL-M5 V1.2
    The bulb also uses a SM2135 LED Controller
    [BL602] [SM2135] Surplife APP RGB+WW+CW bulb [BL602] [SM2135] Surplife APP RGB+WW+CW bulb [BL602] [SM2135] Surplife APP RGB+WW+CW bulb

    Since this is a BL602 chip I had to remove the module from the board to get to the flashing pins on the back of the module

    [BL602] [SM2135] Surplife APP RGB+WW+CW bulb

    I used a soldering iron to remove it but I think it would be easier with a hot air station.
    To flash the chip, I used USB to TTL adapter

    TX -- RX
    RX -- TX
    Ground -- Ground
    3.3 V -- 3.3V
    Boot -- 3.3 only during flashing (I see other post saying a 10k resistor should be used but I couldn’t get the flashing complete unless I connected boot to 3.3v directly)

    Here is more detailed post
    https://www.elektroda.com/rtvforum/topic3889041.html

    After flashing this is the pins for this bulb

    [BL602] [SM2135] Surplife APP RGB+WW+CW bulb

    This is the second bulb I have with BL602 (first on is a sonoff B05-BL-A19), with both bulb the brightness is low after flashing OpenBeken.
    I used (BP5758D_Current 50) command for the sonoff to adjust the brightness

    But for the SM2135 controller I used the command (SM2135_Current 6 2)

    But still the RGB collors need to be calibrated and I havn't done that.

    Cool? Ranking DIY
    About Author
    Zain00
    Level 11  
    Offline 
    Zain00 wrote 61 posts with rating 20, helped 3 times. Been with us since 2023 year.
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  • #2 20389547
    p.kaczmarek2
    Moderator Smart Home  
    Thank you for your interesting review. It's nice to see that OpenBL602 can be really useful for some people. I'm happy that it works even with LED drivers.
    Btw, we'll be adding SM2235 soon as well (it's like SM2135 but with 10bit colour precision instead of 8 bit).

    Regarding calibration, that feature was submitted by a contributor, so I can only point you towards: https://github.com/openshwprojects/OpenBK7231T_App/blob/main/docs/led_gamma_control.md
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  • #3 20390067
    Zain00
    Level 11  
    @p.kaczmarek2 I appreciate all the hard work you’ve done for OpenBeken software and your support in the community.

    Regarding the RGB Colors, I changed the map to "SM2135_Map 0 1 2 4 3" and did the calibration and I think it's emitting the right colors now.

    I also changed the minimum brightness to "brtMinCW 0.40%" because the bulb turned off when I select brightness of 7 and below

    I ordered a few bulbs from AliExpress and I will do a review on them when they arrive.

    I just hope the color temperature is 2700k because this bulb said 2700k but my eyes see 3000k. The Sonoff bulb was close to 2700k though.
  • #4 20444820
    Jinaria
    Level 8  
    I have the same lamp, bought in pack of 4 and the set arrived with a remote control that seems to be using RF to send data as I can't find any IR receiver on the board. the LED controller (?) on mine is BP5758.
    Is there any support for remote control in this firmware?

    [BL602] [SM2135] Surplife APP RGB+WW+CW bulb
  • #5 20444976
    p.kaczmarek2
    Moderator Smart Home  
    We have IR but the interrupt is not ported yet for BL602, I would need to look into that.

    The BP5758 configuration is similar like here:


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  • #6 20445050
    Jinaria
    Level 8  
    As I said it's not an IR remote, seems to be RF remote with just a red LED and even if I cover the LED, the remote function without any issues, I'll try to dump the firmware but first I have to figure out how to do it on this chip!

    Added after 16 [minutes]:

    I just checked inside the remote, As suspected, it's RF Remote with an antenna, sanded chip without marking and JWT 24,000C12 Crystal.

    Added after 10 [hours] 22 [minutes]:

    Update: The remote control is using Bluetooth (mesh?) feature of BL602 to control the bulb features, I will post a tear down of the bulb and remote control tomorrow.
  • #7 20465496
    rojoricardo
    Level 4  
    I have that exact same bulb, bought the 4 pack, i tried flashing two of them. Flashing was successfull however it got into a bootloop, and no wifi access point.
    Followed the video, followed your recomendation to not use a 10k resistor, and as i said the flash went through, but no good after that.
  • #8 20465509
    Zain00
    Level 11  
    Are you using your FTDI adapter to power the chip? if you are using it, the adapter mostly doesn't have enough juice to power it.
    If that's the case and your flash was successful, try reinstalling the module to the bulb. Access point should appear.
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  • #9 20465585
    p.kaczmarek2
    Moderator Smart Home  
    @Zain00 you have very good point, if he powered it from some kind of UART to USB adapter, then it may indeed bootloop
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  • #10 20466434
    rojoricardo
    Level 4  
    @Zain00 @p.kaczmarek2 You were absolutely right, I re-soldered the chip back into its original bulb and there it was the AccessPoint. Thanx for the help!
    I hope this helps guys.
    DON'T use FTDI / USB to UART to power these chips (or at least the BL-M5 V1.2)

    Added after 27 [minutes]:

    @Jinaria What was your module configuration, because mine have the same controller as yours.

    Added after 19 [minutes]:

    >>20445050
    Did you manage to get the RF controller working for these bulbs, i have the same one but with another led driver, but im guessing the RF is about the same
  • #11 20493415
    p.kaczmarek2
    Moderator Smart Home  
    By the way, it's important to note that SM2135_Current arguments are not raw values, they are entries from the following table:
    Code: text Expand Select all Copy to clipboard
    
#define SM2135_10MA         0x00
#define SM2135_15MA         0x01
#define SM2135_20MA         0x02  // RGB max current (Chip default)
#define SM2135_25MA         0x03
#define SM2135_30MA         0x04  // CW max current (Chip default)
#define SM2135_35MA         0x05
#define SM2135_40MA         0x06
#define SM2135_45MA         0x07  // Max value for RGB
#define SM2135_50MA         0x08
#define SM2135_55MA         0x09
#define SM2135_60MA         0x0A

    SM2135 CurrentHex Value
    10mA0x00
    15mA0x01
    20mA0x02
    25mA0x03
    30mA0x04
    35mA0x05
    40mA0x06
    45mA0x07
    50mA0x08
    55mA0x09
    60mA0x0A
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  • #12 20697914
    jrhenk
    Level 10  
    Hi!
    I just got my first BL602 smart bulb today, not from Sonoff but from "CozyLife" (via the aliexpress 3 for 6 dollar deal). After getting the diffuser off to identify the chip, I'm a bit hesitant to disassemble it further - everything just looks too fragile. So as always, I'd like to try Tuyacloudcutter but I couldn't find an imagefile on github for cloudcutter for this chip. Could you be so kind to add one, even if it were just for latest version that has the HA double naming issue addressed? Or is it not possible to flash it with cloudcutter?
  • #13 20697962
    p.kaczmarek2
    Moderator Smart Home  
    It is totally impossible to flash it with cloudcutter. It's most likely even non-Tuya SDK. You have to do this:
    https://www.youtube.com/watch?v=L6d42IMGhHw
    You can also see our second bulb video:
    https://www.youtube.com/watch?v=2e1SUQNMrgY&ab_channel=Elektrodacom
    Helpful post? Buy me a coffee.
  • #14 20698051
    ferbulous
    Level 18  
    @jrhenk do you have a link for that? i assumed they'd still be using esp for their homekit firmware because I have cozylife downlight with esp8285
    As for the bulb teardown, you can use something like this to remove the bottom cap, insert 3/4 in then pull slightly until they pop off. Easier to put the cap back in, and less damaging than using pliers.

    White E27 light bulb socket holder with plug, switch, and visible internal contacts.
  • #15 20698495
    jrhenk
    Level 10  
    >>20697962
    Thanks for this info - I guess that explains why I wasn't able to connect it with the tuya app for 10 minutes, after that I gave up. Also thanks for the links to the disassembling and flashing guide. Seems like a longer adventure I need to find time for but an interesting challenge :)

    Added after 10 [minutes]:

    >>20698051
    Yeah it's still strange that so many different chips doing the same thing are being used and I bet it's just due to pennies in difference. I got this one, but for roughly half the price using the app - so if the attempts flashing it fail, it will be no big loss https://www.aliexpress.com/item/1005005730079037.html

    Interesting little device you showed there, that indeed should help with the process! Funny enough the other day I watched a random video why the ones underneath exist in the US where you sometimes seem to find light sockets at the bottom of a wall - it's the inverted version of what you showed :)
    Light bulb to electrical socket adapter with plug
  • #16 20699920
    jrhenk
    Level 10  
    On closer inspection of the product page and the packaging I noticed that there is indeed no "works with tuya" logo anywhere. This is a first for me and seems I was just lucky until now, but this surely improved my aliexpress skills and I will look for this from now on. It's interesting in so far, as there are bulbs for the same price that work with tuya.
    Now I'm wondering: Are there nevertheless devices out there with a BL602, W800 or W600 chip that do work with tuya? If not I'd say we could carefully assume that "works with tuya" is equal to featuring a BK7231T or BK7231N chip, which would be a good finding.
  • #17 20699927
    ferbulous
    Level 18  
    BL602 is usually for ewelink from my previous purchase
  • #18 21336493
    yonubear
    Level 3  
    >>20388539

    I know this is a old post but I am working on the same model bulb and can't even seem to get it to come on only the web panel so wanted to see if you had any suggestions
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  • #19 21336880
    p.kaczmarek2
    Moderator Smart Home  
    Wait, so do you get web page or not? Did you get OpenBL602 access point?

    WiFi will not work well if powered directly through USB to TTL converter, you need better power supply.
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  • #20 21337178
    yonubear
    Level 3  
    >>21336880
    ok lets try that again

    i get the web panel I have it flashed and back on mains power but I am getting no leds and am confused on what I could be setting wrong

    Added after 4 [hours] 46 [minutes]:

    >>21337178

    may have figured it out looks like i may have damaged the PC so gotta have a look at it a bit closer and see
  • #21 21338103
    p.kaczmarek2
    Moderator Smart Home  
    What do you mean by "damaged the PC"? You can't connect mains-powered device to the PC... those power supplies are not isolated.
    Helpful post? Buy me a coffee.
  • #22 21342844
    yonubear
    Level 3  
    >>21338103

    typo should have been PCB on the led board when I was dissasembling
  • #23 21344442
    p.kaczmarek2
    Moderator Smart Home  
    Oh, I see, you got me pretty worried. It's always better to... damage the device PCB instead of damaging your PC.

    Still, the PCB could be repaired, can you show detailed photos of it in the current state?
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Topic summary

The discussion centers on a low-cost Surplife APP-controlled RGB+WW+CW smart bulb featuring a BL602 chip (BL-M5 V1.2 module) and an SM2135 LED controller. The bulb is a no-name brand purchased from Amazon.sa, with users attempting to flash and customize it using OpenBL602 firmware. Challenges include accessing flashing pins by desoldering the BL602 module, power supply issues during flashing (notably insufficient current from FTDI adapters causing bootloops), and configuring LED color mapping and brightness calibration. The SM2135 controller supports current settings from 10mA to 60mA with specific hex values. Some users report the bulb uses an RF remote control operating via Bluetooth mesh on the BL602 chip, complicating remote support in firmware. Attempts to use Tuya Cloudcutter fail due to the non-Tuya SDK nature of the BL602 platform. Similar bulbs from other brands like CozyLife also use BL602 but are incompatible with Tuya firmware. Proper power supply and re-soldering the module back to the PCB are critical for successful flashing and WiFi access point appearance. The discussion includes teardown tips, firmware links, and notes on LED driver variants such as BP5758 and upcoming support for SM2235 (10-bit color precision). Overall, the thread provides practical insights into hardware hacking, firmware flashing, and firmware compatibility issues for BL602-based smart bulbs with SM2135 LED drivers.
Summary generated by the language model.
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