We’re done! The ambilight is in place behind my monitor and has been running great. To finish up, I wanted to reflect a bit on what I learned and talk about where to go from here.

This post is part of a series on creating a DIY ambilight using Adalight and WS2812B LEDs. Check out the project page here.

Things Learned

Although I had gotten my feet wet with addressable LEDs for the ‘Footwell NeoPixels’ project (which is currently on the back burner…), this was my first finished project using them. For being so inexpensive, they are powerful and ridiculously easy to use. Look for more projects featuring them in the future.

On the software side, I learned quite a bit about serial structure and speed. I also learned how to use Git, created a Git repository for my own Adalight software, and contributed to a few open source projects along the way.

I also learned how to design a PCB using Eagle and how to etch copper clad boards at home. Although Eagle is now defunct (thanks Autodesk!), I’m sure I can transfer the basic ideas to another CAD program.

Further Improvements

As with any project, there is more I’d like to do with this eventually.

Top of my list is extending the LED leads so the monitor can be tilted through its entire range. This isn’t an issue at the moment, but it’s poor design to build something that adds unintentional limitations to the existing hardware.

I’d also like to design and build a version 2 PCB, which ditches the Arduino Nano and has all of the Atmega components onboard. I’d also like to add a few other things, such as:

  • Headers for the LED leads
  • Calibration setting jumper
  • Checksum status LED
  • Multiple LED data output leads (for expansion)

Prismatik, as useful as it is, could also use some attention to improve the color calibration UI and add more advanced support for the Adalight protocol. I’ve submitted feature requests to psieg’s fork, but I may find myself contributing some code to that project in the future.


In the words of the great Porky Pig, “ble, ble, ble, that’s all folks!” Thanks for following along. Onto the next!


  1. Hi, thanks for the very thorough tutorial!

    You mentioned on further improvement, that you are looking at expandability. I currently have one screen and would like to add a TV to my setup. What I would like to do is to have the PC monitor for gaming and the TV for films. Both of the screens will be equipped with Ambilight. But That when I watch a Film and turn off the Pc Monitor only the LEDs from the TV would light up, and vice-versa. Is this currently possible with the Arduino configuration? Thanks in advance!


    1. Hi Daniel! That’s a PC software limitation, not an Arduino one. The capture software I’m using (Prismatik) currently does not support multiple monitors / ambilights, although you may be able to find software that does.

      1. Ok, thanks for the comment. I´ve set up my Ambilight already on one monitor :). I have also increase the bud rate for better FPS perfomance in games. Everything works perfectly

          1. Not really. In theory it’s working as intended, as the colors aren’t at the edges of the display so there’s no reason to extend them.

            You could create another preset with the grab zones manually moved to the edge of the letterbox zone, but you would have to do that by hand.

  2. Hi Dave!
    I was thinking about DIY Ambilight for pc, and eventualy I found your (awesome) project. Now I´ve got everything ordered, but I have few questions regarding the connection:
    1. If I want to connect strip from both sides to power, I just connect the beginning cables to +5V and GND and second par of cables too to +5V and GND? Data wire should be connected only from one side, right?
    2. How should be capacitor connected? From +5V power supply to one leg of the capacitor to the strip and from GND to second leg of the capacitor to strip?
    Thx for your work, your projects are great!

    1. Hi Dom!

      1. Exactly right. The strip should be labeled with “Data In (DI)” on one side and “Data Out (DO)” on the other. Make sure you’re wiring the data connection to the right side or it won’t work.
      2. Yes, the capacitor is wired in parallel to the power lines. Most electrolytic capacitors are polarized, so be sure to connect the longer lead to 5V.

      Best of luck!

      1. So the Arduino came and Ambilight is working. I just need to do calibration and change position of the monitor – currently monitor is in corner and one wall behind monitor is green, and that green wall really affects colors from Ambilight – in the bad way. Every color has a greenish tinge. Once I get those things sorted out, I´ll post there a video.

  3. Dave, I was hoping you might have some insight on a problem I’m having. I did a build like yours using an Uno R3, and it’s working minus one small issue. A ten led section of my leds don’t turn off regardless of if they’re off in Prismatik or Prismatik is disconnected. They do react to color and change appropriately, but they never go off. I’m kinda flummoxed. Is this a hardware thing? Something weird in my config in Prismatik?

    I appreciate any help, thanks.

  4. Hello Sir,
    Great project, I’ll be tackling it soon myself. I have a question tho. Have you ever done any research whether it is possible to launch two Prismatiks at once if someone wants to put Ambilight on two monitors (with two arduinos of course)?

    1. You cannot launch two instances of Prismatik unfortunately. You can spread the capture zones across monitors to use a single Arduino with a long strip, but I don’t believe there’s an easy way to replicate this setup with multiple monitors.

  5. Hello, thank you for your inspiration, now I’ve set up my 24” pc monitor AND my 55” lg oled tv with 100 led, and THAT is breathtaking! I will post soon a video about that. The only thing now is that the TV is driven by an Arduino Uno connected to my Windows pc with Prismatik, the downside is that I need the PC on in order to control the light. I found an android app that successfully connect to prismatik remotely with the API fully functioning, so now I can both control the lights with the video source from the PC and the phone app. My next idea was to transfer the “prismatik job” from the pc to a small android mini-pc to serve as a always on home-hue-media hub. Do you think that would be than possible to feed that hub via USB or with LAN (through the remote APIs) with the video data (talking again of 30 to 60fps) ?

    Thank you again for your amazing and clean job!

    1. Glad you found the information useful!

      Not sure I entirely follow what you want to do, but you can definitely centralize the light management of multiple lights under one PC. Though it’s easier if the “grab” calculations are local to the video source to keep the data throughput down.

      It’s been awhile since I worked with the Prismatik API, but from what I remember it’s not possible to get the current colors for each LED, only to write them. Keep that in mind when you map out how everything flows together.

  6. Hey Dave. Not sure if I’m now double posting, my comment disappeared, could be antispam, who knows.

    I’m wondering if there’s any chance you have suggestions on interfacing Prismatik or the Arduino itself with Smartthings. The only negative of moving over from static bias to this is that I can’t simply plug them into a smart switch and trigger them with a wall switch or Google Assistant. This gets particularly bad in the living room that doubles as a guest room and has an always on PC.

    Since Smartthings can control over lan, but not Telnet I’m thinking the best strategy would be something like this: https://github.com/jgillman/lightpack-prismatik-http-api running on a Pi and a Smartthings device handler could fairly easily send on/off commands. That being said, my programming competence runs out roughly with setting up projects other people have built and documented, so any suggestions would be much appreciated.

    1. Hey Adi!

      Yep, your first message got caught in the spam filter. No worries on that.

      To make sure I’m understanding you: you’re trying to figure out how to turn the ambilight on/off using a smart home manager? I’ve never messed with Smartthings myself so I’m not sure how much I can help. If the device handler allows you to configure a websocket request you could do it all within that, otherwise that API looks like a good option. You could run it in the background on the PC and avoid using the Pi to make things easier.

      If you just want to turn it off there’s a lot of options, although putting the LED power supply through a smart outlet is probably the easiest. If you want finer control (modes, colors, profiles, etc.) and the hub software doesn’t support it, you’d need some sort of relaying device to translate commands into websocket commands (again the http API you found could work). I’m sorry I can’t be of more help, I know next to nothing about how the Smartthings system works.

      1. Wow, so suuuper shitty me there. Sorry, posted then immediately went to Florida to do disaster relief with minimal connectivity and even less personal bandwith.

        Basically, yeah. As best I understand it smartthings can’t handle Telnet, which I think is what I understand the Prismatik plugin is setup for, hence the server somewhere. I’d be happy for it all to be contained on the PC, though I suppose an argument could be made for the Pi which is truly always on, as opposed to 95% on.

        Ideally, yeah It’d be great to actually control profiles and colors etc, but just taking care of the on/off would solve 99% of use cases I have. My impression though was that just powering off the ac adapter wasn’t a consistent solution. Having tested pulling the plug it doesn’t come back on consistently and seems to disconnect the Arduino (going by the windows device removed sound that plays). I’m not 100% sure why that’s happening, the Arduino is hooked to the USB and the lights via the data and ground pins. Since it’s powered over USB I would have thought there’d be no impact of pulling what seemed like it’d amount to an extra ground.

        1. The other reason I was leaning toward the Pi, is that given my minimal competence, if I were capable of making small changes to an existing server, and making that work, it’d be a lot easier than starting from less/nothing heh

        2. If you switched the microcontroller to something Internet-enabled you could even put all of the IoT functions on the microcontroller itself, though that would require some legwork to get up and running.

          If pulling power from the device is causing issues then yeah, I think that http API would be your best bet. Although if the device is working as an ambilight already I think the Pi would be overkill, just because it has to run through the computer regardless. You could still tweak things on the fly on the PC, it’s just a different platform.

          1. That’s definitely something I’ve considered, there is some manner of support for some of the internet enabled pis/shields but I’ve been concerned that maybe my competence runs out far short of that.

            Any ideas on the power situation? I tried hooking the pi up to an ac adapter as well, but it still toggles off when power is pulled from the lights. Restarting Prismatik fixes it, but I’m not sure anyway to automate that.

          2. It’s hard to comment on the power issues without being there looking at everything. I’d say if pulling the power is causing you headaches I’d just look for software workarounds in the meantime.

  7. Hey Dave, I had your Ambilight project on my radar for a while now. First time I saw it, I was blown away by how awesome it looked and the fact, that it was a DIY for the most part.

    Long story short, I made my own Ambilight and can not be any happier! Thank you for all the information and explanations! My Ultrawide 34′ monitor is now an absolute dream to work/watch/game on.

    As I have every part multiple times lying aroudn here, I am ready to do another one for the familiy etc. 🙂

    Finally, maybe you should do a TL;DR section, because it is quite overwhelming when you go through all your information and chapters.

    1. Hey there! Thank you for the compliments, I’m so glad you found the information useful!

      I have thought about putting together a more condensed overview of the whole project, though I’ve never gotten around to it. Perhaps I’ll find some time this year to rework the series, or perhaps even take another crack at the project and improve it! I just need to finish up some of my (many) in progress projects first.

      1. Yea, maybe add a chapter where only the steps needed to get the strips working are shown. For more detailed information there are the other chapters which you have now.

        I know there are tutorials etc. for ambilight for TVs but maybe you want to get a shot at that?

        Either way, thanks for all the hard work 🙂


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