#define LED_PIN 11
#define POTENTIOMETER_PIN A1
#define LED_PIN 12 
#define POTENTIOMETER_PIN A2 
#define LED_PIN 13 
#define POTENTIOMETER_PIN A3

void setup()
{
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);
}

void loop()
{
  int potentiometerValue1 = analogRead(A1);
  int brightness1 = potentiometerValue1 / 4;
  int potentiometerValue2 = analogRead(A2);
  int brightness2 = potentiometerValue2 / 4;
  int potentiometerValue3 = analogRead(A3);
  int brightness3 = potentiometerValue3 / 4;
  analogWrite(11, brightness1);
  analogWrite(12, brightness2);
  analogWrite(13, brightness3);
}