const int push_green=5;     // use pin 5 for green's push button 
const int push_red=6;       // use pin 6 for red's push button  
const int push_blue=7;      // use pin 7 for blue's push button  
const int led_green=2;      // use pin 2 for green LED's cathode
const int led_red=3;        // use pin 3 for red LED's cathode
const int led_blue=4;       // use pin 4 for blue LED's cthode
int status_green=0;         // to store the value of the push button input green
int status_red=0;           // to store the value of the push button input of red
int status_blue=0;          // to store the value of the push button input green
const int gnd_pin=13;       // use pin 13 as extra ground by pulling it LOW (Optional, if not needed can use the common ground)


void setup() {
  // put your setup code here, to run once:
  pinMode(push_green, INPUT);     //            Initializing the  
  pinMode(push_red, INPUT);       //                    digital pins as Inputs
  pinMode(push_blue, INPUT);        //            as well as outputs so that it
  pinMode(led_green, OUTPUT);       //          gets input from PIN 5,6,7 and 
  pinMode(led_red, OUTPUT);       //        Pulls PIN 2,3,4 to ground accordingly
  pinMode(led_blue, OUTPUT);        //      by pulling to ground the cathode completes the circuit and forms 
  pinMode(gnd_pin, OUTPUT);       //      a closed loop which allows current to flow through it and lights up the LED
  Serial.begin(9600);     // To begin the serial communication protocol
}

void loop() {
  clean();      // function call
  status_green=digitalRead(push_green);     // gets input from push button and saves in status_para
  status_red=digitalRead(push_red);         // when push button is not engaged the 
  status_blue=digitalRead(push_blue);       // digital pins receives +5 volts but when pushed the +5V drops to 0
  digitalWrite(gnd_pin, LOW);         // pulling PIN 13 to LOW to make it as an additional ground terminal
  if(status_green==0)        // if  then pull particular digital pin to LOW to make it a closed circuit and makes the LED light up
      {
          clean();      
          digitalWrite(led_green, LOW);
          Serial.print("Green");
          Serial.print("\n");
        }
      else if(status_red==0)
      {
          clean();
          digitalWrite(led_red, LOW);
          Serial.print("Red");
          Serial.print("\n");
        }
      else if(status_blue==0)
      {
          clean();
          digitalWrite(led_blue, LOW);
          Serial.print("Blue");
          Serial.print("\n");
        }
      if(status_green==0 && status_red==0)
      {
          clean();
          digitalWrite(led_green, LOW);
          digitalWrite(led_red, LOW);
          Serial.print("Orange");
          Serial.print("\n");
        }
      if(status_green==0 && status_blue==0)
      {
          clean();
          digitalWrite(led_green, LOW);
          digitalWrite(led_blue, LOW);
          Serial.print("sky blue");
          Serial.print("\n");
        }
      if(status_red==0 && status_blue==0)
      {
          clean();
          digitalWrite(led_red, LOW);
          digitalWrite(led_blue, LOW);
          Serial.print("Violet");
          Serial.print("\n");
        }
      if(status_red==0 && status_green==0 && status_blue==0)
      {
          clean();
          digitalWrite(led_red, LOW);
          digitalWrite(led_green, LOW);
          digitalWrite(led_blue, LOW);
          Serial.print("White");
          Serial.print("\n");
        }
  delay(100);        
}

void clean(){             // additional function to make the digital pins 2,3,4 to HIGH to turn all the LED off if the push button is not engaged
    digitalWrite(led_green, HIGH);
    digitalWrite(led_red, HIGH);
    digitalWrite(led_blue, HIGH);
}