int redLedPin = 11;
int greenLedPin = 10;
int blueLedPin = 9;
int adcValue;

void setup() {
  // put your setup code here, to run once:
  pinMode(redLedPin, OUTPUT);
  pinMode(greenLedPin, OUTPUT);
  pinMode(blueLedPin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  adcValue = analogRead(A0); // convert A0 to digital
  analogWrite(redLedPin, map(adcValue, 0, 1023, 0, 255)); // PWM duty cycle of red pin port

  adcValue = analogRead(A1); // convert A1 to digital
  analogWrite(greenLedPin, map(adcValue, 0, 1023, 0, 255)); // PWM duty cycle of green pin port

  adcValue = analogRead(A2); // convert A2 to digital
  analogWrite(blueLedPin, map(adcValue, 0, 1023, 0, 255)); // PWM duty cycle of blue pin port
}