#include <Wire.h> 
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

#define S0 6
#define S1 7
#define S2 8
#define S3 9
#define sensorOut 10

int redFrequency = 0;
int greenFrequency = 0;
int blueFrequency = 0; 
    
void setup()   { 
  lcd.begin(16, 2);
  Serial.begin(9600);

  pinMode(S0, OUTPUT);
  pinMode(S1, OUTPUT);
  pinMode(S2, OUTPUT);
  pinMode(S3, OUTPUT);
  pinMode(sensorOut, INPUT);

  digitalWrite(S0, HIGH);
  digitalWrite(S1, LOW);

}  
 
void loop() {
 
  lcd.home();
  
  digitalWrite(S2, LOW);
  digitalWrite(S3, LOW);

  redFrequency = pulseIn(sensorOut, LOW);
  lcd.print("R=");
  lcd.print(redFrequency);
  delay(100);

  digitalWrite(S2, HIGH);
  digitalWrite(S3, HIGH);

  greenFrequency = pulseIn(sensorOut, LOW);
  lcd.print(" G=");
  lcd.print(greenFrequency);
  delay(100);

  digitalWrite(S2, LOW);
  digitalWrite(S3, HIGH);

  blueFrequency = pulseIn(sensorOut, LOW);
  lcd.print(" B=");
  lcd.println(blueFrequency);
  delay(100);
  return;

}