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  • Is this on an Arduino or something else like ESP8266? Commented Jan 12, 2019 at 21:36
  • It is an Arduino Uno Commented Jan 12, 2019 at 21:39
  • How are you powering the LEDs? Commented Jan 12, 2019 at 22:50
  • I noted that each example in fastled library, ‘’clear’’ the array, after running ‘’show’’ function. Try with: leds[i]= CRGB::Black; after ‘’show’’. Commented Jan 12, 2019 at 22:57
  • what happens if you put FastLED.show(); and delay(100); after the for loop Commented Jan 12, 2019 at 23:08

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