#define SERIAL                  // Comment this line out, to disable serial comms


#define greenLEDPin      9      // LED connected to digital pin 9
#define redLEDPin       10      // LED connected to digital pin 10
#define blueLEDPin      11      // LED connected to digital pin 11

#define redSensorPin    A0      // pin with the photoresistor with the red gel
#define greenSensorPin  A1      // pin with the photoresistor with the green gel
#define blueSensorPin   A2      // pin with the photoresistor with the blue gel

int redValue = 0;               // value to write to the red LED
int greenValue = 0;             // value to write to the green LED
int blueValue = 0;              // value to write to the blue LED

int redSensorValue = 0;         // variable to hold the value from the red sensor
int greenSensorValue = 0;       // variable to hold the value from the green sensor
int blueSensorValue = 0;        // variable to hold the value from the blue sensor

void setup() {

#ifdef SERIAL
  Serial.begin(9600);           // initialize serial communications at 9600 bps:
#endif


  // set the digital pins as outputs
  pinMode(greenLEDPin, OUTPUT);
  pinMode(redLEDPin, OUTPUT);
  pinMode(blueLEDPin, OUTPUT);
}

void loop() {
  // Read the sensors first:
  // read the value from the red-filtered photoresistor:
  redSensorValue = analogRead(redSensorPin);
  // give the ADC a moment to settle
  delay(5);


  // read the value from the green-filtered photoresistor:
  greenSensorValue = analogRead(greenSensorPin);
  // give the ADC a moment to settle
  delay(5);


  // read the value from the blue-filtered photoresistor:
  blueSensorValue = analogRead(blueSensorPin);

#ifdef SERIAL
  // print out the values to the Serial Monitor
  Serial.print("raw sensor Values \t red: ");
  Serial.print(redSensorValue);
  Serial.print("\t green: ");
  Serial.print(greenSensorValue);
  Serial.print("\t Blue: ");
  Serial.println(blueSensorValue);
#endif

  /*
    In order to use the values from the sensor for the LED, you need to do some
    math. The ADC provides a 10-bit number, but analogWrite() uses 8 bits.
    You'll want to divide your sensor readings by 4 to keep them in range
    of the output.
  */
  redValue = redSensorValue / 4;
  greenValue = greenSensorValue / 4;
  blueValue = blueSensorValue / 4;


#ifdef SERIAL
  // print out the mapped values
  Serial.print("Mapped sensor Values \t red: ");
  Serial.print(redValue);
  Serial.print("\t green: ");
  Serial.print(greenValue);
  Serial.print("\t Blue: ");
  Serial.println(blueValue);
#endif


  /*
    Now that you have a usable value, it's time to PWM the LED.
  */
  analogWrite(redLEDPin, redValue);
  analogWrite(greenLEDPin, greenValue);
  analogWrite(blueLEDPin, blueValue);
}