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24v COB rgb 840 strip controled by Raspberry Pi

fskrzycki

I am having a hard time figuring out the solution to controlling my 24v strip with my Pi 4. I have a 4 pin strip with R. B. G. Bk wires.  I think a N-channel MOSFETs transistor will fix the communication issue and allow control of the colors. most Ara fruit software I have seen is for addressable Leds with only 3 leads. R. Bk. and Green.  Am I on the right track with using the transistors. If so Why? is there an easier way? I am making a bay blade stadium for my son and want to incorporate buttons with lights and sound.. 

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  • This probably needs a circuit sketched. From the website I'm unclear if the LED strip has a common ground, or a common positive supply.

    If you're using MOSFETs, then one of the two circuits below could be used (replicated three times, i.e. for red/green/blue channels).

    Circuit A would be for the scenario where the common connection is ground. Circuit B is for the scenario where the common connection is 24V.

    Scenario A needs three P-ch MOSFETs, whereas Scenario B needs three N-ch MOSFETs. Also, zener diodes (approx 12V) are definitely worthwhile, it is best to add them in to protect the MOSFET gate connections. The NPN transistors can be 2N3904. Scenario B uses two NPN transistors per channel. 

    The circuit is getting complicated enough though, that it would be worth putting this on a PCB, otherwise there's a risk of shorts etc (which could fry the Pi or the LEDs). The easier solution would be to use LED strips that are called (say) Neopixel or WS2812B, because they eliminate all of this circuitry and can (kind of) be driven directly by the Pi, although it is definitely worth using a "Neopixel Driver" type of board for it, because the Pi's output is not quite compatible with those strips, and some level conversion is done by the board (perhaps it may work without it, but best to have the board to have completely reliable output). Personally I'd swap out the LED strip if possible, unless you really need to use the LED strip that you have. 

    image

  • in reply to shabaz

    Shabaz has the DIY down pat, me not so much. I'm an off the shelf person.

    image

    I have used these modules often to drive higher loads than the output from a Pi or an Arduino. I use a level shifter 

    image

    to have 5V's as the gate input trigger. Again it is a off the shelf module to avoid DIY PCB builds. 

  • in reply to colporteur

    Originally i only planned on having lights for the stadium and purchased a Tuya WB5 controller.  The controller was a simple solution to Bright stadium lights.  then a saw a Raspberry Pi used as a talking box. youtu.be/BjXERzu8nS0  the code was simple and hardware was cheep.  So decided to add some buttons. one of course will count down to "let it rip!"

    I may be making this harder on myself... Is it possible for my Pi to controll the Tuya WB5 controller over wifi instead of me using the Smart app on my phone? 

  • in reply to fskrzycki

    Tuya changed the firmware. Tuya-Convert file not an option. Guess I'm back to DIY

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