[BK7231T/WB2L] Lepro LE Wifi Smart LED Bulb A19 E26 Model No. 901003-US SM2135

Hi,

I found a bulb which doesn't appear to be listed. I attempted to add it but the interface insists that I haven't said enough and I really don't have anything else to add.

Lepro | LE Wifi Smart LED Bulb A19 E26, WB2L with SM2135

Deconstructed as all other similar bulbs. Did not use a pipe wrench but rather pried the base off with a sharp utility knife.

Flashed with BK7231T using the Windows flash tool. A bit of a Pfaff using the "quickly toggle power on/off" technique to enter boot mode.

1.) Lepro | LE Wifi Smart LED Bulb A19 E26 Model No. 901003-US
2.) Chip: WB2L with I2C SM2135 LED driver
3.) WB2L Pin mapping:
WB2L P1 --> SM2135 I2C Data --> Pin 7 BK7231T
WB2L P2 --> SM2135 I2C Clock --> Pin 8 BK7231T
WB2L P0 P5 P4 --> Unused
4.) SM2135 Pin mapping (SM2135_MAP 2 1 0 3 4):
OUT1 --> Blue
OUT2 --> Green
OUT3 --> Red
OUT4 --> W
OUT5 --> C
5.) Two images of deconstructed bulb attached. RST on WB2L is not accessible with chip removal. Tx, Rx, V , V- are easily reached.

Thanks! I edited the title to be more descriptive.

You have been lucky with those RX/TX pins access. In case of our bulbs, we had to desolder the WB2L_M1:


Do you happen to also have photos of bulb packaging?

Bulb packaging and reverse of WB2L PCB board showing soldering points. Bulb was purchased on Amazon.ca

I have almost identical bulb but labelled as a Laxihub brand, model LAB22S. This example has a bayonet A60/B22 fitting. This device is the only other device in the list so far with matching GPIOs: https://www.elektroda.com/rtvforum/topic3954346.html

Some pics



I decided to desolder and flash module rather than solder in-situ



boot






also required is to limit RGB LEDs to 15mA and CW to 40mA though maybe better to go lower to prolong the life of the LEDs.

This makes the OBK template

https://github.com/OpenBekenIOT/webapp/pull/94

How did you desolder the WiFi module? It looks like a good job, I see even pads are cleaned.

I added a little bit of pb solder to each contact, rather than creating a big sausage covering the whole module bottom. this was enough to make contact with the factory solder when I held the tip of the soldering iron along the whole bottom and it all melted at once.

I always clean with IPA after soaking up final solder from the PCB with copper braid.

So you've basically used method from our video, nice.

correcto.

It is worth to note that the same method also works for WB3S/CB3S modules as long as only the two rows of pins are soldered:

Still, this may be tricky, so I'd recommend considering hot air first.

By the way, I'm doing some hot air tests in my free time, here you can check out current version (comparison of five stations):
https://openshwprojects.github.io/hotair/350c.html
https://openshwprojects.github.io/hotair/450c.html