Hello readers! So I have followed this youtube tutorial, connected everything together and tried to get things works. All the initial problems were solved, for example: - hyperion not starting up (fixed, by buying the correct usb grabber) - Kodi connection error (fixed, by enabling remote control in kodi) My problem: The leds just don't light up after the initial start. I've searched other posts having similar issues: - https://hyperion-project.org/threads/leds-dont-light-up.3325/ - https://hyperion-project.org/threads/help-276-leds-not-responding.3264/ - https://hyperion-project.org/threads/rpi3-arduino-pro-mini-atmega2560-ws2812-slow-updates.3173/ - https://hyperion-project.org/threads/benefits-of-using-raspberry-pi-with-arduino.2768/ - https://hyperion-project.org/threads/cant-get-hyperion-to-work.709/ None helped and none provided any proper solution if the author managed to get it to work. He just "somehow got it", without providing any information which is frustrating. I'm trying to set up 90 leds for start (i'd like to go as high as possible, because i have 3 led strips each having 300 leds). I'm also posting my arduino sketch file and hyperion config along with the "sudo service hyperion status" command output. I have also recorded with my phone what happens and taken the pictures of the connection. Images: Videos: https://www.youtube.com/watch?v=n8rDcNHGUMM&feature=youtu.be On video 1, i start the hyperion service manually, which causes the arduino to start the initial led strip light up, then it just stops. You can also see the green light on the arduino flashing when hyperion starts (it's the TX diode, i guess it receives traffic). After that, nothing happens. I also played around with the BUADRATE and had no success as with the priority number of the USB grabber. The USB grabber works fine, because i tested the hyperion-v4l2 command with the "--screenshot" flag which gave me the picture of the movie i've played on my TV. What i don't have connected is the HDMI switcher. I've seen that the code is checking which channel is active on the switcher but that's also it, nothing else is checking that parameter for actual functionality in the sketch code. I would appreciate anyone helping me on this as i'm out of ideas what to actually change. Everything seems to be done properly, yet it doesn't work. Help!