/*     Arduino Color Sensing Tutorial

     *      

     *  by Dejan Nedelkovski, www.HowToMechatronics.com

     *  

     */

    #define S0 4

    #define S1 5

    #define S2 6

    #define S3 7

    #define sensorOut 8

    int frequency = 0;

    void setup() {

      pinMode(S0, OUTPUT);

      pinMode(S1, OUTPUT);

      pinMode(S2, OUTPUT);

      pinMode(S3, OUTPUT);

      pinMode(sensorOut, INPUT);

      // Setting frequency-scaling to 20%

      digitalWrite(S0,HIGH);

      digitalWrite(S1,LOW);

      Serial.begin(9600);

    }

    void loop() {

      // Setting red filtered photodiodes to be read

      digitalWrite(S2,LOW);

      digitalWrite(S3,LOW);

      // Reading the output frequency

      frequency = pulseIn(sensorOut, LOW);

      // Printing the value on the serial monitor

      Serial.print("R= ");//printing name

      Serial.print(frequency);//printing RED color frequency

      Serial.print("  ");

      delay(100);

      // Setting Green filtered photodiodes to be read

      digitalWrite(S2,HIGH);

      digitalWrite(S3,HIGH);

      // Reading the output frequency

      frequency = pulseIn(sensorOut, LOW);

      // Printing the value on the serial monitor

      Serial.print("G= ");//printing name

      Serial.print(frequency);//printing RED color frequency

      Serial.print("  ");

      delay(100);

      // Setting Blue filtered photodiodes to be read

      digitalWrite(S2,LOW);

      digitalWrite(S3,HIGH);

      // Reading the output frequency

      frequency = pulseIn(sensorOut, LOW);

      // Printing the value on the serial monitor

      Serial.print("B= ");//printing name

      Serial.print(frequency);//printing RED color frequency

      Serial.println("  ");

      delay(100);

    }