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Tuya E14 Lamp RGB+CW+WW - 9w [Belon BL2028N] (BK7231N)

kaankasim88 363 3
  • Cheap Aliexpress bulbs with apparently a unique board.
    Tuya E14 Lamp RGB+CW+WW - 9w [Belon BL2028N] (BK7231N)
    RX and TX is exposed on the backside and I successfully flashed with this tool, https://github.com/OpenBekenIOT/hid_download_py. No need to desolder anything.

    I used this command: (first I took a backup)
    Code:
    python uartprogram OpenBK7231N_app_QIO_1.0.0.bin --unprotect -d com10 -w --startaddr 0x0




    Tuya E14 Lamp RGB+CW+WW - 9w [Belon BL2028N] (BK7231N) Tuya E14 Lamp RGB+CW+WW - 9w [Belon BL2028N] (BK7231N) Tuya E14 Lamp RGB+CW+WW - 9w [Belon BL2028N] (BK7231N)
    Tuya E14 Lamp RGB+CW+WW - 9w [Belon BL2028N] (BK7231N) Tuya E14 Lamp RGB+CW+WW - 9w [Belon BL2028N] (BK7231N) Tuya E14 Lamp RGB+CW+WW - 9w [Belon BL2028N] (BK7231N)

    LED IC is "BP1633"
    Tuya E14 Lamp RGB+CW+WW - 9w [Belon BL2028N] (BK7231N)

    It's marked as FL_M95_V1.
    Tuya E14 Lamp RGB+CW+WW - 9w [Belon BL2028N] (BK7231N) Tuya E14 Lamp RGB+CW+WW - 9w [Belon BL2028N] (BK7231N)

    Pin settings:
    Tuya E14 Lamp RGB+CW+WW - 9w [Belon BL2028N] (BK7231N)

    Cool? Ranking DIY
    About Author
    kaankasim88
    Level 3  
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    kaankasim88 wrote 5 posts with rating 0, helped 0 times. Been with us since 2022 year.
  • #2
    p.kaczmarek2
    Level 28  
    Hey, can you specify which pins of FL_M95_V1 are VDD and GND? The remaining pads needed for programming are clearly visible on the photo (RX1, TX1, CSN/CEN)...
  • #3
    kaankasim88
    Level 3  
    By VDD, do you mean VCC? I used these pins successfuly, but I didn't actually need to connect these for successful programming. It still flashed.

    Tuya E14 Lamp RGB+CW+WW - 9w [Belon BL2028N] (BK7231N)
  • #4
    p.kaczmarek2
    Level 28  
    VDD is the same as VCC.

    I am not sure if 5 is really VDD. I'd guess that pads marked 0-5 are PWMs:
    5PWM5I/OGPIOP_26, which is connected to the P26 pin on the internal IC
    6PWM4I/OGPIOP_24, common GPIO, which is connected to the P24 pin on the internal IC
    7PWM0I/OGPIOP_6, which is connected to the P6 pin on the internal IC
    10PWM1I/OGPIOP_7, which is connected to the P7 pin on the internal IC
    13PWM3I/OGPIOP_9, common GPIO, which is connected to the P9 pin on the internal IC
    14PWM2I/OGPIOP_8, which is connected to the P8 pin on the internal IC

    Those signals are broken out on the pads. Futhermore, one pad is GND and one (not marked?) is VDD - 3.3V.

    I think flashing might have worked for you because pins have protection diodes to VDD and BK can run with a lower voltage that 3.3V (including diode drop) but you did not identify the VDD correctly. Still, good job, as it worked and obk flashed.