Which microcontroller is inside the current Action LSC Smart E27 806 lm bulb?
Most 2022-2023 units ship with a BK7231T Wi-Fi SoC once covered by a sticker [Elektroda, Tych0, post #20138269]
LSC Smart E27 806lm CW - BK7231T
TL;DR
- A cheap LSC Smart E27 806lm CW bulb from Action was opened, identified, and flashed for local control.
- The bulb uses a BK7231T chip, with clearly marked TX/RX pads on the PCB and PWM outputs for cold and warm white channels.
- It cost about 4 euro in the Netherlands, under article number 3000272, and the author mapped pin 24 to CW and pin 16 to WW.
- After flashing, it appeared correctly in the Home Assistant GUI, and the bulb was reassembled by gluing the transparent top back on.
- Disassembly takes patience and a steady hand; prying the shell, removing glued boards, and soldering tiny TX/RX pads can damage the bulb if rushed.
Generated by the language model.
A very cheap E27 smart bulb. Bought at Action store at around 4 euro in NL, article number 3000272.
Overall quality is good enough considering the item price. I use it in hallways, storage room, toilet etc.
Opening the light is pretty easy. If you have some experience opening devices, you can easily pry it open en glue it back together without damage.
I use a 9mm thin blade, see picture. Slide the blade between the 'transparent' plastic and the base of the light. And keep turning the bulb in your hand, while you use the other hand to push the blade further into the bulb. It might take some time and force before you notice the top of bulb will loosen up. Just try to tilt the transparent piece after every other turn. Eventually it will separate from it's base.
When you've separated the bulb. You have to remove the LED board. Remove the glue around the board with a screwdriver and a sharp blade. I use a little metal hook that I've bend into an L-shape to pull out the LED board. Keep removing glue until it will pop out. Pull it out straight otherwise you'll damage the pins that hold the board to the base of the bulb.
Finally, remove the metal cap at the bottom of the bulb with a sharp balde or screwdriver. It's not screwed in or glued, just pull it out.
You'll see a little metal wire. Carefully bend it to the center of the bulb, into the hole.
Now that you've loosen the the metal wire at the bottom. You can pull out the main PCB of the bulb a little bit, for 5 to 10mm.
When the sticker on the chip is removed. I found a BK7231T.
On the bottom of the PCB you'll find the pins you need for flashin. They are clearly marked. The TX and RX are small but with a steady hand and your soldering iron, you'll manage to attach some wires.
Flash it with your USB UART flashing device and set pin 24 as PWM value 4 (CW) and pin 16 as PWM value 5(WW).
This is the YAML configuration I use in HA.
The light shows up as I expect in the HA GUI.
Put everything back together in reverse order. Glue back the transparent top of the bulb, and you're done.
Happy flashing!
Overall quality is good enough considering the item price. I use it in hallways, storage room, toilet etc.
Opening the light is pretty easy. If you have some experience opening devices, you can easily pry it open en glue it back together without damage.
I use a 9mm thin blade, see picture. Slide the blade between the 'transparent' plastic and the base of the light. And keep turning the bulb in your hand, while you use the other hand to push the blade further into the bulb. It might take some time and force before you notice the top of bulb will loosen up. Just try to tilt the transparent piece after every other turn. Eventually it will separate from it's base.
When you've separated the bulb. You have to remove the LED board. Remove the glue around the board with a screwdriver and a sharp blade. I use a little metal hook that I've bend into an L-shape to pull out the LED board. Keep removing glue until it will pop out. Pull it out straight otherwise you'll damage the pins that hold the board to the base of the bulb.
Finally, remove the metal cap at the bottom of the bulb with a sharp balde or screwdriver. It's not screwed in or glued, just pull it out.
You'll see a little metal wire. Carefully bend it to the center of the bulb, into the hole.
Now that you've loosen the the metal wire at the bottom. You can pull out the main PCB of the bulb a little bit, for 5 to 10mm.
When the sticker on the chip is removed. I found a BK7231T.
On the bottom of the PCB you'll find the pins you need for flashin. They are clearly marked. The TX and RX are small but with a steady hand and your soldering iron, you'll manage to attach some wires.
Flash it with your USB UART flashing device and set pin 24 as PWM value 4 (CW) and pin 16 as PWM value 5(WW).
- platform: mqtt
name: "obk06B22AC7"
unique_id: "obk06B22AC7"
command_topic: "cmnd/obk06B22AC7/led_enableAll"
state_topic: "obk06B22AC7/led_enableAll/get"
availability_topic: "obk06B22AC7/connected"
payload_on: 1
payload_off: 0
brightness_command_topic: "cmnd/obk06B22AC7/led_dimmer"
brightness_scale: 100
brightness_state_topic: "obk06B22AC7/led_dimmer/get"
brightness_value_template: "{{value}}"
color_temp_command_topic: "cmnd/obk06B22AC7/led_temperature"
color_temp_state_topic: "obk06B22AC7/led_temperature/get"
retain: false
The light shows up as I expect in the HA GUI.
Put everything back together in reverse order. Glue back the transparent top of the bulb, and you're done.
Happy flashing!
Comments
Very nice teardown! I also have seen Action stores in Poland. This bulb is very cheap as well in my country, it's for about 15 PLN (Polish Zloty). By the way, it might be possible to flash this bulb... [Read more]
Thx. Yes I'm aware of the Cloud Cutter capabilities and for sure it might be able to program your firmware on the device. But what's the fun of that :-) I enjoy opening up these devices desolder modules... [Read more]
Currently in Poland PLN 18, but still very cheap: https://www.action.com/pl-pl/p/inteligentna-arowka-led-lsc-smart-connect/ He's probably in other countries too. Thank you for the presentation... [Read more]
Thanks for more information, they have a set of 3 garden lamps RGB + W for PLN 89, which is quite a nice price, they also have a smart spotlight with a motion sensor. You will have to find a store nearby... [Read more]
Let me know when you buy, photos from inside / tearedown topic is also well known, maybe even a small gift from Electrode could be found for you. I am curious how this motion sensor works, but it will... [Read more]
If you can do a teardown of what's in Action, I'll send you some electrode gifts :) Thank you! [Read more]
If someone does not want to flash, he can integrate this bulb via tuya, you have to build a project on iot.tuya.com. and add it in the tuya app will detect it without any problem. Apparently, the lsc app... [Read more]
I'm buying this bulb a lot and it always came with a esp8266 which I quickly flashed to tasmota. Now they silently changed the chipset to BK7231T and I thought I have to buy much more expensive bulbs to... [Read more]
It is indeed 26. The pin 16 does not even support PWM function. Why do you think they "silently changed the chipset to BK7231T"? [Read more]
My guess would be cost reduction, probably the Beken chips are a few cents or fractions of a cent cheaper than the Espressif chips [Read more]
Maybe it's about licensing problems? [Read more]
Thanks for the nice writeup! Since I bought the same ones (3000272-970716) also in NL my small comment is that flashing directly using Tuya Cloudcutter works perfectly so no need to open the bulb anymore! There... [Read more]
Hi there, i have a very similar bulb, 2000273 instead of 2000272 - it's basically the same bulb but with 1400 instead of 800ish Lumen... After some searching around, from what i gather on the tasmota... [Read more]
Beken chips have 6 possible PWM pins. Have you checked them all? Is your device CW? If none of PWM combinations are working, then you might have a bulb with a dedicated LED driver chip with a variation... [Read more]
Yes, it's a CW device... I did notice this as well, the config page states that "BK7231N/BK7231T supports PWM only on pins 6, 7, 8, 9, 24 and 26!" How would i go about testing the other 'pins' ...do... [Read more]
Well... the simplest way... would be to try setting 6, 7, 8, 9 24 and 26 to "Relay" role and give each of them a separate channel, 6 will be channel 0, 7 channel 1, 8 channel 2, 9 channel 3, 24 channel... [Read more]
Aaaah, i see what you did there. That actually got me somewhere... Turned out, 7 and 8 (once on channel 1 and 2) did the trick. One switched on full white, the other switches on full warm/yellow. Removed... [Read more]
Hey, I uploaded to the bulb 1.12.19 on the AP everything works perfectly. After adding to the HA generated yaml by OPENBK, I can't do automation on this bulb. Bulb not showing in devices. Is it possible... [Read more]
@piotrdobron which HA version? Maybe you need to add Unique ID or Entity ID? [Read more]