BL602 IoT Lamp Breakout Board: Pinout Layout & Flashing Tips

Question

Hello. I got a new IOT device and it came with a BL602 on a breakout board. I am not sure what the layout of this board is and how I would connect to get it flashed. If anyone can provide me with some tips that would be great.

p.kaczmarek2 · Answer

It should be very simple. It has all required pins on the back side of the board. See: - 3.3V - BT (bootloader) - RX1 - TX1 - GND It's all that's needed. You should follow my guide at: or an english version at: By the way, where did you get that device? Can you please provide more information, I would like to buy one for testing.

bl602newbie · Answer

Thank you for the reply. Maybe you could highlight which pins correspond to which. 3 volts is obvious but the rest may not be. Also for future reference of anyone else. Especially which pin is boot on the picture.

p.kaczmarek2 · Answer

BT = BooT = Bootloader. RX from board should be connected to TX from UART to USB converter, and TX from board should be connected to RX from USB to UART converter. (UNLESS someone is using non-standard naming on board, then please switch RX and TX). Are you aware that you should use 3.3V power supply for that? 5V connected to 3.3V pin would burn BL602.

bl602newbie · Answer

thank you very much for your answer and your tip. What I meant was which pin corresponds to which pin on the board.so 3v3 pin is obvious the 3 volt pinGnd is obviously groundbut then it's only written as 22 17 C Wmaybe if you could specify22 = ?17 = ?C = ?W=?and I'm not sure if we need the pins on the back of the board.

p.kaczmarek2 · Answer

Well, if it's a RGBCW bulb, then C is a cool white channel, W is warm white, R is red, G is Green, B is Blue. I don''t know about L and A, can you show the whole device you have? also, have you tried looking at this image? You can see where the dot mark is on your photo:

bl602newbie · Answer

Well that is the issue. Figuring out the pinout from the chip diagram to the actual board. So we know we need for example TX and RX and the BOOT pin but which pins are those on the actual PCB board that are labeled using that combination of letters.I am really not good at following the traces on the board. I suspect that these letters and numbers mean something but I'm not experienced enough either to know what they are referring to. I can't post a link to the product but it's just a lamp holder. It's a socket for a light bulb nothing else. It should just turn a bulb on or off.

p.kaczmarek2 · Answer

This is very simple. You align the pinout image just so it matches the dot mark (first pin) and then look at pins. See: Your photo is a bit blurry, so I am not able to tell 100% which pin goes where, but as you can see, I marked pins with colors.... This is what I do to find out the pins of unknown module. I have never seen your module before.

p.kaczmarek2 · Answer

Here is a related topic, also discusses the SM-028_V1.3 module Polish link: English link:

divadiow · Answer

I believe the topic of the thread is this device, which does indeed come with an SM-028_V1.3 module If correct I'll flesh this post and its profile out.

divadiow · Answer

95% sure I have the device in question. The template on devicelist doesn't contain any pin assignments so I suggest it be changed to: Code: JSONLog in, to see the code boot log: Code: TextLog in, to see the code the assignments at the end of the log seem to suggest the red LED (wifi status is blue - P22) is GPIO0 but this doesn't appear controllable, PWM, LED, REL etc So the behaviour with this template is the blue LED is flashing until wireless is connected, then it's off the red LED comes ON with the bulb ON - ie the relay closed. perhaps it serves as a warning that the socket is live, rather than a signal the bulb is off. Factory firmware backup attached

tadeu1 · Answer

Question, there's another way to get the bootloader pin instead the microchip and that test point?

divadiow · Answer

not entirely sure what you mean but the BT pin only goes to that test point, so no.

p.kaczmarek2 · Answer

Well, I'm not sure what he means either, but if there is no test point, he could, theoretically, solder directly to QFN pad...

tadeu1 · Answer

Is it possible to replace the BL602 with an ESP-02S with Tasmota?

p.kaczmarek2 · Answer

OpenBeken provides a good level of compatibility with Tasmota, it can work with Tasmota API calls (cmnd format is the same and returned JSON matches), it can pair with Tasmota Device Groups directly, and it can run with ioBroker just like Tasmota does, so it's the simplest and most recommended choice there. Still, if you really want to replace BL602 module with ESP8266 (ESP-02S) then you need to check if GPIOs are matching. It seems that two most important pads, name 3V3 and GND are matched well. So, then we only have to check if remaining pins can fit. I think that RST may be problematic, if your device expects a control signal there. Also AD can also be an input, not an about, etc. So, it fits, more or less, but specifics may vary. In worst case you'll have to manually solder a small wire to use different GPIO for some signal. Why do you want to replace BL602 with ESP-02S and which BL602 device do you have exactly?

tadeu1 · Answer

I broke the boot pinout on BL602 and I have 10 ESP-02s. It's a power outlet. I tried a lot of stuff to figure out mine; it's the SM-028 1.3. It's already soldered with Tasmota. But I can't figure out the GPIO to fix it.

p.kaczmarek2 · Answer

I would need to see the photos, but you certainly can give it a go. Even with our OpenESP8266. Flash the module with chosen firmware first. Then solder it into socket. You'll then be able to see if it still boots and shows on your WiFi. As I said, the most important fingerprint of module - power lines (3.3V and GND) are matching, so it should be relatively easy to get this running.

tadeu1 · Answer

Actually I can access it, configure to connect to my network, and it's already soldered in the PCB It's the back part; the front is only. Option to solder D13, D4, D5

tadeu1 · Answer

With this config for now, I can turn on and off, LED blue still on when is on and nothing when is off.I'm trying to figure out to fix the button first then the energy controller.Any guess?

p.kaczmarek2 · Answer

I would need to know more about your device. I don't even see the information what kind of power metering IC do you have? I guess it's either BL0942 or BL0937, but who knows... You don't have much GPIO options, but using multimeter to check how it's all connected is safest bet.

tadeu1 · Answer

Is there an easy way to guess what's in the solder point? Like D4 is a button, etc?I'll open it to check the chip for energy.

p.kaczmarek2 · Answer

Well, we have GPIODoctor, which can be used to quickly sample pins: We also have Tuya config extraction, but not for BL602.... but @divadiow did some experiments with BL602 as well, do you have original 2MB flash backup from BL602 chip>?

divadiow · Answer

@tadeu1 you could see what the python script in attached zip here gives you when run against your BL602 backup

tadeu1 · Answer

Some pics Added after 1 [minutes]:>>21791979 Thanks, man, have 2 of thoseOne, I broke the IC0 pin; that's why I soldered the ESP-02sI'll do the backup in the other one.

p.kaczmarek2 · Answer

BL602 backup guide: But, now you can also use our flasher: So maybe try out flasher first and let us know how it works.

tadeu1 · Answer

>>21791979 I try to use the python I read from 0x000000 to 0x1FFFFF Code: text Expand Select all Copy to clipboardB:Sonoff_Devices_DIY_Tools-masterBouffaloLabDevCube-v1.9.0>ler.py flash.bin Found 1 DTB candidate(s). == DTB #1 @ file offset 0x001FC000, size 0x1BA2 (7074 bytes) ==   Failed to parse DTB: 'int' object has no attribute 'decode' ######################## SUMMARY: Extracted DT properties ######################## No extractable /config_gpio or /gpio DT subtree found in any DTB candidate. attached the flash.bin thats the log from boufalou [13:57:45.416] - ========= Interface is uart ========= [13:57:45.416] - com speed: 2000000 [13:57:45.416] - Eflash load helper file: B:Sonoff_Devices_DIY_Tools-masterBouffaloLabDevCube-v1.9.0chipsbl602eflash_loader/eflash_loader_40m.bin [13:57:45.416] - ========= load eflash_loader.bin ========= [13:57:45.416] - Load eflash_loader.bin via uart [13:57:45.417] - ========= image load ========= [13:57:45.698] - Not ack OK [13:57:45.699] - FL [13:57:45.701] - result: FL [13:57:45.978] - tx rx and power off, press the machine! [13:57:45.978] - cutoff time is 0.1 [13:57:46.088] - power on tx and rx [13:57:46.899] - reset cnt: 0, reset hold: 0.005, shake hand delay: 0.1 [13:57:46.900] - clean buf [13:57:46.909] - send sync [13:57:47.129] - ack is 4f4b [13:57:47.175] - shake hand success [13:57:47.191] - get_boot_info [13:57:47.193] - data read is b'010000000000000003000400b5923d0286241d00' [13:57:47.193] - ========= chipid: 2486023d92b5 ========= [13:57:47.193] - last boot info: None [13:57:47.193] - sign is 0 encrypt is 0 [13:57:47.193] - segcnt is 1 [13:57:47.200] - segdata_len is 38592 [13:57:47.284] - 4080/38592 [13:57:47.368] - 8160/38592 [13:57:47.452] - 12240/38592 [13:57:47.535] - 16320/38592 [13:57:47.619] - 20400/38592 [13:57:47.703] - 24480/38592 [13:57:47.789] - 28560/38592 [13:57:47.874] - 32640/38592 [13:57:47.957] - 36720/38592 [13:57:47.997] - 38592/38592 [13:57:47.999] - Run img [13:57:48.106] - Load helper bin time cost(ms): 2688.489501953125 [13:57:48.213] - Flash load shake hand [13:57:48.231] - default set DTR high [13:57:48.337] - clean buf [13:57:48.347] - send sync [13:57:48.574] - ack is 4f4b [13:57:48.620] - Read mac addr [13:57:48.622] - macaddr: b5923d028624 [13:57:48.622] - flash set para [13:57:48.623] - ========= flash read jedec ID ========= [13:57:48.624] - Read flash jedec ID [13:57:48.624] - flash jedec id: c8401580 [13:57:48.624] - Finished [13:57:48.631] - get flash size: 0x00200000 [13:57:48.631] - ========= flash read jedec ID ========= [13:57:48.633] - Read flash jedec ID [13:57:48.633] - flash jedec id: c8401580 [13:57:48.633] - Finished

divadiow · Answer

I'm not entirely sure how much of this is relevant or of use, but here's the result of the script on your backup file. Code: TextLog in, to see the code Code: TextLog in, to see the code so, maybe...? Code: TextLog in, to see the code (GPT summary - away from home/low on time at the mo)

tadeu1 · Answer

The problem is: Tasmota only. Have BL0973 CF, not CF1 or SEL.ThanksI'll try to get it. Works on ESP-02S

p.kaczmarek2 · Answer

This has different name in Tasmota, but works the same as in OBK. See a random Tasmota template: I have underscored the roles you need to set. Of course, for your device, pin indexes will be different!

BL602 IoT Lamp Breakout Board: Pinout Layout & Flashing Tips

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