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:
https://www.elektroda.pl/rtvforum/topic3889041.html
or an english version at:
https://www.elektroda.com/rtvforum/topic3889041.html

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 pin
Gnd is obviously ground
but then it's only written as 22 17 C W
maybe if you could specify
22 = ?
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