Led pixels trouble

[christophe]

I have an arduino uno, 12v ws2812 pixels 100 leds and power supply 12v 10A. Unfortunately i am trying to power them but they are not working. Do you guys know why? The pixels dont have a constant colour. The first 5 always stay white and flickers and the rest go crazy.

 

[OzAz]

Sounds like a data issue.
Not familiar with using an Arduino to control pixels @keithsw1111 is the only person I know who is familiar with it.

 

[AAH]

I might be wrong but I am fairly certain that WS2812 is a 5V only device. There's a few other WS281X variants so if they are 12V I hope that they are 1 of them. Ut should say on the pcb if they are 5V or 12V.

 

[Patchezza]

I seen this issue where colours are different down the line because the 5v drops over the length of leds, just inject 5v to the string about half way, and that should sort it out