#include <Adafruit_NeoPixel.h>

int pin=12;
int no_led=20;
Adafruit_NeoPixel ring=Adafruit_NeoPixel(no_led, pin);

void setup() {
  // put your setup code here, to run once:
  ring.begin();
}

void loop() {
  // put your main code here, to run repeatedly:
  for (int i=0; i<no_led; i++)
  {
    ring.setPixelColor(i, ring.Color(156, 72, 243));
    ring.show();
    delay(500);

    if (i<10)
    {
      ring.setPixelColor(i, ring.Color(40, 219, 193));
      ring.show();
      delay(500);
    }
    else
    {
      ring.setPixelColor(i, ring.Color(266, 150, 65));
      ring.show();
      delay(500);
    }
  }
}