Arduino Uno and FastLED WS2812B Glitching

Question

I’m using an Arduino Uno and a fastLed WS2812B. I have the leds set up correctly. Every 2 seconds, the lights pause of about a second and display seemingly random colors.

Does anyone know what's wrong?

My code:

#include <FastLED.h>

#define LED_PIN   7
#define NUM_LEDS  10

CRGB leds[NUM_LEDS];


void setup() {
  FastLED.addLeds<WS2812, LED_PIN, GRB>(leds, NUM_LEDS);

}

void loop() {
  for (int i = 0; i < NUM_LEDS; i++){
    leds[i] = CRGB(0,0,255);
    FastLED.show();
    delay(100);
  }
  for (int i = 0; i < NUM_LEDS; i++){
    leds[i] = CRGB(255,0,0);
    FastLED.show();
    delay(100);
  }
}

Answer 1

I have run the code on the Arduino simulator online. If it is working in the Arduino Simulator chances are less that it has to do something with the code itself.

Hence, also as the root cause was found to be about sharing the ground @Majenko

This is also one example of solving the problem step by step. validating one section after the other. using the simulator you can verify that the code is working fine. later, proceed to verify the hardware. I hope this helps.

You can verify the FastLED code here (you can modify the parameters)