white led stripe

How can Rpi Python PWM GPIO pins control brightness of white LED strips of 3 to 4 1W 350mA power LEDs?

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I’m trying to figure out my first RaspberryPi (3B+) project, where I’m going to manage 3-4 White LED Strips with following specifics for a single one:

  • 350mA Constant Current (max 400mA)
  • 39,6V Voltage
  • 13,86W for each LED module
  • Dimmerable LEDs

I’m trying to avoid the “hard way” for the moment (not for lazyness; I want to start gradually), so I would like to avoid any DIY electrical circuitry (if not absolutely mandatory), but I’m trying to find a specific dimmer/multi-dimmer module to manage the LEDs:

  • attachable to RPi GPIO
  • able to provide the right amount of power to the LED(s)

Can you help me to find such a module or is it just “a dream” and I need to dirty my hands 🙂 ? In this case … could you suggest to me a feasible solution or explanation?

Thanks a lot for your help and sorry if I have not provided all requested info.ledShareEditFollowClose 2Flagedited 4 mins agotlfong013,51633 gold badges77 silver badges2222 bronze badgesasked 16 hours agoEchoes_8610722 bronze badges New contributor

  • RGB or white? single led or stripe? (1) aliexpress.com/popular/led-rgb-dimmer.html, (2) electronics.stackexchange.com/questions/552849/… – tlfong01 16 hours ago    
  • 1Sorry … Stripes and White – Echoes_86 15 hours ago
  • 1Ah, for dimming white LED stripes, Alibaba has cheap solutions for you. DIY, on the other hand, is very hard. See my comments in the following question: LED Driver for street light 50W: electronics.stackexchange.com/questions/552849/…. Cheers. – tlfong01 14 hours ago    
  • 1@tlfong01 could you please explain or link some material where I can understand how I can get the connections? I mean “where” I need to plug the strips, the power supplies, etc. I’m missing the part: out of GPIO I have 3mA per Pin. I need 350mA. Where I can get it from? Do I need an auxiliary power supply? How can I link it ? Thanks a lot! – Echoes_86 14 hours ago
  • 1Just a quick reply. (1) You need a transistor to amplifier the GPIO pin’s small, less than 5mA current to bigger than 300mA current. For example, you can use a 2N2222 transistor to control a 20mA status/indicator LED, or 100mA for a power RGBYW LED. (2) You can then use a GPIO output pin in PWM mode connected to the Base of the 2N2222 to control the Collector current and thus the brightness of the power LED. – tlfong01 11 hours ago   
  • 1You might find useful references in this chat: chat.stackexchange.com/transcript/119380/2021/2/5 – tlfong01 11 hours ago   
  • 1You might be interested of the following: AliExpress Diymore LED Lamp Driver PWM Dimmer DC7-30V to DC1.2-28V 350mA 1W – US$1 es.aliexpress.com/item/…. Cheers – tlfong01 9 hours ago    
  • (1) Your question mentioning “39,6V” seems confusing, please clarify. (2) You spec of “13.86W” seems too strict. Perhaps you can give us a link to your stripe” Cheers. – tlfong01 45 secs ago   Edit   

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