@Alexandr-Didenko said in How to control WS281x RGB LED strip?:

If disconnect WS2813 from omega2 pin and connect again - then WS2813 behaves wrong.

Note that WS2813 DIN pins are quite delicate, and very easy to destroy or at least get a latch-up.

Never send a data signal to a WS2813 which is not powered with 5V properly. if the cable is longer than a few inches, use a shielded cable for the data. maybe use a serial resistor in the data line to dampen spikes a bit - you have quite heavy undershoots on your scope diagrams you posted earlier in this thread.

First pixel sometimes shifting. For strip consisting of 10 LEDs - in programm we must write 11 LEDs

Sounds like a damaged first LED to me.

I thought it was a problem on my side. But no. It in Omega or yours side.

I'd be surprised.

Because in the meantime, I have used the exact same circuitry for a large installation with 20 Omega2 each driving 518 WS2813, and all of them ran 100% stable severals days uninterrupted. One of these panels still is in my office and I use it to test new stuff every day, and it runs practically 24/7.

Only one caveat: if you have software installed that makes use of the other hardware PWM unit's interrupt, please make sure to use the latest p44-ledchain (OpenWrt 18.06 build here), because there was a bug in handling the PWM interrupts.

WS2813 led is update ws2812b led is dual signal ,signal break out contious transmission.
sk6812 led is the same with ws2812b,but it's better than ws2812b,much stable.