Greetings fellow lemmings! I have a problem and i was hoping your smart brains could help me solve it. I want to use an arduino and some addressable LED strips as an „ambilight“ upgrade for my pc. I soldered everything according to some instructions on the webz. I also provide enough electricity for the strips via a 12v charger. When I power them on (no matter if the arduino is turned on or not), they just blink randomly. Only a few led on the 4 strips I connected (to make corners for my monitor). The data input from pin 5 on my arduino is completely ignored when it is turned on. So I think it’s a wiring problem. But I don’t see the issue. On the picture you see the input connections i soldered. The strips are just connected together by wires. Ground to ground, data to data, power to power. Is my dumb smooth brain keeping me from my plans, or is there something broken? I only have replacement led strips, but I don’t know why the arduino or the power supply should be broken

update for everyone who cares: A friend of mine and me were troubleshooting (he has a multimeter and another arduino), and we came to the conclusion that I need an even stronger power supply. The leds on the new strips are much more powerhungry than the old ones. So I’ll try to get a more reasonable power supply (we did the math and I need one with 5V and 20 Amps, the current one is 12V with 1.4 Amps) and I will post another update.

Thank you so much for your help, everyone!

next update: With a lab power supply we measured, that the strips need much less power than it says in the description of the LED strip. It works flawlessly with a 5v and 4a power supply. My connections were right, but not the power delivery.

Thank you again everybody! I learned quite a lot 😊

  • SirBucksworthOP
    2•6 months ago

    Thank you for your quick response!

    Did you test your equipment before soldering it together? Then after soldering it does not work?

    Unfortunately I did not, but the arduino and the power supply were already in use as an ambilight some months ago (I bought a preassembled kit back then). I got a new screen, so i stored the devices until yesterday, when my new LED strips arrived. Everything worked until then.

    Is it three wires you are connecting: 5V power, +data (PD5), then ground connection on the strip?

    Exactly. Also for good measure I also connected ground from the arduino with the ground pin from the strip. Is that a problem? It used to be wired that way before… but the old strips had less LEDs.

    By this you mean that no V is seen or it is acting like it is not connected, it is binary so it has the neccasary V or it does not (0V or 5V).

    I updated the fastled library on the arduino und set it to use port5 of the arduino. When everything is connected I turn on prismatik and it says it sends signals to the arduino. The work indicating led on the arduino blinks accordingly. But the led strip blink does not change. Unfortunately I have no device to measure if there is any output from the pad.

    You need to make sure you did not fry the arduino. Is there a way to check it by software? But it behaves as it used to, when the old ambilight was working.

    Quick search I found this short video with great information:

    Thank you for the recommendations! I‘ll check them out!

    • @jimmydoreisalefty
      -3•6 months ago

      Is there a way to check it by software? But it behaves as it used to, when the old ambilight was working.

      It would be dead (no lights or anything) if you fried it; I have fried a good amount on my end when I was doing projects with them, hahaha.

      I’ll be on hold until you get the chance to watch and read the video and article; it should be able to help you figure out if you are missing some of the basics.

      • SirBucksworthOP
        2•5 months ago

        I just posted the update as an edit of this post.

        Thank you again for the help and the links, that was really helpful while troubleshooting!