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#define S0 4
#define S1 5
#define S2 6
#define S3 7
#define sensorOut 8

int redFrequency = 0;
int greenFrequency = 0;
int blueFrequency = 0;

void setup() {
  pinMode(S0, OUTPUT);
  pinMode(S1, OUTPUT);
  pinMode(S2, OUTPUT);
  pinMode(S3, OUTPUT);
  
  pinMode(sensorOut, INPUT);
  
  digitalWrite(S0,HIGH);
  digitalWrite(S1,LOW);
  
  Serial.begin(9600);
}
void loop() {
  digitalWrite(S2,LOW);
  digitalWrite(S3,LOW);
  
  redFrequency = pulseIn(sensorOut, LOW);
  
  Serial.print("R = ");
  Serial.print(redFrequency);
  delay(100);
  
  digitalWrite(S2,HIGH);
  digitalWrite(S3,HIGH);
  
  greenFrequency = pulseIn(sensorOut, LOW);
  
  Serial.print(" V = ");
  Serial.print(greenFrequency);
  delay(100);
 
  digitalWrite(S2,LOW);
  digitalWrite(S3,HIGH);
  
  blueFrequency = pulseIn(sensorOut, LOW);
  
  Serial.print(" B = ");
  Serial.println(blueFrequency);
  delay(100);
}