I have a RPI3 B+ running LibreElec +hyperion My video (DISH receiver) has RCA connectors out, going to a frame grabber, then to RPI This seems to be working ok as I can grab screenshots My led's are 2812b connected to Arduino Uno. RPI connected to Arduino by usb. I know the leds work because I have ran schetches on the arduino to test. I just cannot get any lights to work in this configuration Any help would be appreciated