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Heruled Tuya WiFi Smart LED Controller - Lightning Semiconductor LN8825B chip

divadiow 3885 38
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  • #31 21243234
    divadiow
    Level 34  
    hot air yes. Maybe I'm being a little ambitious. I guess I'd need to sort aerial and oscillator as minimums. hmmm.

    I've just watched this https://www.youtube.com/watch?v=eSbZMZ7Y9IU
    Code: Text
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    I'm looking through the datasheet and talking to ChatGPT about it.

    Added after 35 [minutes]:

    Actually, I might chicken out and look to just get some magnet wire to route all the test pads out to breadboard or rows of jumper headers. Use existing PCB and casing.
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  • #32 21262264
    divadiow
    Level 34  
    they're dinky little things. Will start with enamelled wire and case hacking approach first though.

    Microcontroller, wire coils, and a Sharpie marker on a table.
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    #33 21262268
    p.kaczmarek2
    Moderator Smart Home  
    You will also need to add 100nF capacitors between VDD and GND pins for stable operation. At least one I guess. I'm not sure about other LN8825B pins, but often microcontrollers require a bit more components, like this 12k resistor for ESP8266:
    ESP8266 microcontroller connection diagram with capacitors and resistor.
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  • #34 21262290
    divadiow
    Level 34  
    thank you. maybe that kind of transplant is for another day. Oddly I've chosen 0.8 and 0.2mm wire, something in the middle might have been better. What selections of magnet wire do y'all keep?
  • #35 21262320
    p.kaczmarek2
    Moderator Smart Home  
    You can still try, it's not that hard if you do clean soldering. I've did something similiar in the past, but not with QFN. Only TQFP at most. See:
    Universal starter boards for various SMD microcontrollers with a prototype area
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  • #36 21264697
    divadiow
    Level 34  
    A start. all 32 pins have continuity to outer header. No shorts. Seems I need to power 6 legs in total with 3.3v and, from what I understand, a 0.1 µF capacitor should be used for each.

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    PCB module with a QFN32 chip on a blue background. Five orange ceramic capacitors 0.1 µF on a blue electronics work mat.

    hoping I don't lose steam with it!

    Added after 8 [hours] 28 [minutes]:

    and yes, there is continuity between all 6 pads on the original PCB

    Close-up of a circuit board with a highlighted integrated circuit and solder connections. Pin layout diagram of an integrated circuit with highlighted power pins.

    Added after 1 [hours] 53 [minutes]:

    Diagram of LN8825B module with 32 pins labeled.
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  • #37 21265131
    p.kaczmarek2
    Moderator Smart Home  
    Very good. Don't worry about placing all capacitors. From my experience, if there are multiple internally connected VDD pins, you can just use one 100nF capacitor for the start and it should work, more or less. For testing only, not for production. When I ran PIC32MZ on proto board, I didn't solder as many 100nF caps as there are VDDs.
    Of course, if there is some other pin that requires a capacitor, like, idk, "VDDCORE", and it's not connected to VDD, then you still need to solder that capacitor.
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Topic summary

The discussion revolves around the Heruled Tuya WiFi Smart LED Controller, which utilizes the Lightning Semiconductor LN8825B chip. The original poster expresses disappointment over the chip choice, hoping for an Espressif or Beken chip instead. Several users inquire about the availability of an SDK for the LN8825B and discuss the potential for capturing boot logs. Issues arise regarding the device's functionality, particularly after a possible reverse polarity connection. Users share experiences with flashing firmware, including attempts to use LN882H SDKs and various boot outputs. The conversation highlights the challenges of working with the LN8825B, including compatibility concerns with other models and the need for specific components for successful operation. Some users report success in flashing the device and obtaining UART logs, while others explore the possibility of hardware modifications and transplants to enhance functionality.
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