This is a short teardown of the Cree A21 100W tunable white + color changing bulb. It is sold in the USA and is currently $13 on Amazon, Lowes, and Walmart.
The bulb uses a BK7231T Tuya chip.
![[BK7231T] Cree A21 100W RGBCW bulb [BK7231T] Cree A21 100W RGBCW bulb](https://obrazki.elektroda.pl/2378219100_1669217675_thumb.jpg)
Opening the bulb: take a razor blade and insert it between the top plastic and the base. Then once you have a razor blade inserted, you can stick in a thin metal pry tool and carefully pry the top off.
Then, use the razor blade to pry off the bottom metal part, and then move the live wire out of the way.
Back to the top of the bulb now, the screws are useless -- don't bother removing them. You want to pry the entire board up and out of the housing. Once you do this, the board with the LEDs and the controller separates easily.
Installing OpenBK7231T: solder wires onto the 3v3, GND, TX1 and RX1; connect those to a UART and then follow the flashing instructions. You will need to hold a wire connecting CEN to GND to get the chip into flashing mode.
The pin config is:
* P7: PWM, channel 4
* P8: PWM, channel 5
* P9: PWM, channel 2
* P24: PWM, channel 1
* P26: PWM, channel 3
(First post here, did I do anything wrong? Sorry if I did!)
The bulb uses a BK7231T Tuya chip.
![[BK7231T] Cree A21 100W RGBCW bulb [BK7231T] Cree A21 100W RGBCW bulb](https://obrazki.elektroda.pl/2378219100_1669217675_thumb.jpg)
![[BK7231T] Cree A21 100W RGBCW bulb [BK7231T] Cree A21 100W RGBCW bulb](https://obrazki.elektroda.pl/4344755200_1669217790_thumb.jpg)
Opening the bulb: take a razor blade and insert it between the top plastic and the base. Then once you have a razor blade inserted, you can stick in a thin metal pry tool and carefully pry the top off.
![[BK7231T] Cree A21 100W RGBCW bulb [BK7231T] Cree A21 100W RGBCW bulb](https://obrazki.elektroda.pl/9842861000_1669217815_thumb.jpg)
Then, use the razor blade to pry off the bottom metal part, and then move the live wire out of the way.
![[BK7231T] Cree A21 100W RGBCW bulb [BK7231T] Cree A21 100W RGBCW bulb](https://obrazki.elektroda.pl/7761571400_1669217843_thumb.jpg)
Back to the top of the bulb now, the screws are useless -- don't bother removing them. You want to pry the entire board up and out of the housing. Once you do this, the board with the LEDs and the controller separates easily.
![[BK7231T] Cree A21 100W RGBCW bulb [BK7231T] Cree A21 100W RGBCW bulb](https://obrazki.elektroda.pl/9197257000_1669217878_thumb.jpg)
Installing OpenBK7231T: solder wires onto the 3v3, GND, TX1 and RX1; connect those to a UART and then follow the flashing instructions. You will need to hold a wire connecting CEN to GND to get the chip into flashing mode.
The pin config is:
* P7: PWM, channel 4
* P8: PWM, channel 5
* P9: PWM, channel 2
* P24: PWM, channel 1
* P26: PWM, channel 3
(First post here, did I do anything wrong? Sorry if I did!)
Cool? Ranking DIY