I just recently got back into RPi and was testing some simple things but I'm having a lot of issues with using neopixel library. (https://learn.adafruit.com/neopixels-on ... i/software) It does say that it does not work with RPi 2 but there were lot of commits even for newest Pis so I guess that warning is outdated?
Anyway, I tried pretty much everything I could to try to make it work with PWM and I could not get any output on PWM, disabling sound, disabling/tweaking HDMI, and there was absolutely no output on PIN18 or PIN12. After that I tried with SPI, and that is giving some signal output on PIN10 but the LED strip is not working.
However the LED strip has external PSU so it's not because of not enough juice, I checked different points of strip and it's showing correct voltage. The first LED seems to be working, I tried connecting to other DI skipping 1st LED and didn't help. The strip lights up for split second when connecting PSU and after that nothing. SOMEHOW, once it started working out of the blue, I interrupted the program, wanting to restart it and after that nothing, I can't get it to work anymore.
Any thoughts on this?