#include <FastLED.h>

#define NUM_LEDS 12
#define DATA_PIN 6

// Define the array of leds
CRGB leds[NUM_LEDS];

void setup() {
  Serial.begin(115200);
  
  FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);

  leds[0] = CRGB::Red;
  leds[1] = CRGB::Red;
  leds[2] = CRGB::Red;
  leds[3] = CRGB::Red;
  leds[4] = CRGB::Red;
  leds[5] = CRGB::Red;
  leds[6] = CRGB::Red;
  leds[7] = CRGB::Red;
  leds[8] = CRGB::Red;
  leds[9] = CRGB::Red;
  leds[10] = CRGB::Red;
  leds[11] = CRGB::Red;
  leds[12] = CRGB::Red;
  FastLED.show();

  delay(1500);

  FastLED.clear();

}

void loop() {
  int pot = analogRead(A6);
  Serial.println(pot);
  int numLeds = map(pot, 0, 1023, 0, NUM_LEDS);
  
  // First, clear the existing led values
  FastLED.clear();
  for(int led = 0; led < numLeds; led++) { 
      leds[led] = CRGB::Red; 
  }
  FastLED.show();
}