/* Switches and RGB LED

Circuit Connections:
PIN_3 => Resistor 220Ω =>  Red pin of RGB LED
PIN_5 => Resistor 220Ω =>  Blue pin of RGB LED
PIN_6 => Resistor 220Ω =>  Green pin of RGB LED
PIN_8 => Pull down resistor (220Ω) => switch_1 (Vcc)
PIN_9 => Pull down resistor (220Ω) => switch_4 (Vcc)
*/

#define R_pin 3         //give the name “R_pin” to PIN_3
#define G_pin 6         //give the name “G_pin” to PIN_6
#define B_pin 5          //give the name “B_pin” to PIN_5
#define Sw1_pin 8     //give the name “Sw1_pin” to PIN_8
#define Sw4_pin 9     //give the name “Sw4_pin” to PIN_9

//The setup() function initializes and sets the initial values
//It will only run once after each powerup or reset
void setup()
{
  //Configure PIN_3, PIN_5 and PIN_6 to behave as output
  //Configure PIN_8 and PIN_9 to behave as input
  pinMode(R_pin, OUTPUT);
  pinMode(G_pin, OUTPUT);
  pinMode(B_pin, OUTPUT);
  pinMode(Sw1_pin, INPUT);
  pinMode(Sw4_pin, INPUT);
}

//This function loops consecutively
void loop() {
  if(digitalRead(Sw1_pin)==0 && digitalRead(Sw4_pin)==0){
      //RGB LED is OFF
      analogWrite(R_pin, 0);     //Write 0% PWM to pin 3
      analogWrite(G_pin, 0);     //Write 0% PWM to pin 6
      analogWrite(B_pin, 0);     //Write 0% PWM to pin 5
      delay(1000);                       // Wait for 1 second
  }
  else if(digitalRead(Sw1_pin)==0 && digitalRead(Sw4_pin)==1){
      //red color for RGB = > R=255, G=0, B=0
      analogWrite(R_pin, 255); //Write 100% PWM to pin 3
      analogWrite(G_pin, 0);     //Write 0% PWM to pin 6
      analogWrite(B_pin, 0);     //Write 0% PWM to pin 5
      delay(1000);                       // Wait for 1 second
  }
  else if(digitalRead(Sw1_pin)==1 && digitalRead(Sw4_pin)==0){
      //green color for RGB = > R=0, G=255, B=0
      analogWrite(R_pin, 0);     //Write 0% PWM to pin 3
      analogWrite(G_pin, 255); //Write 100% PWM to pin 6
      analogWrite(B_pin, 0);     //Write 0% PWM to pin 5
      delay(1000);                       // Wait for 1 second
  }
  else{ //if(digitalRead(Sw1_pin)==1 && digitalRead(Sw4_pin)==1)
      //blue color = > RGB=0,0,255
      analogWrite(R_pin, 0);     //Write 0% PWM to pin 3
      analogWrite(G_pin, 0);     //Write 0% PWM to pin 6
      analogWrite(B_pin, 255); //Write 100% PWM to pin 5
      delay(1000);                       // Wait for 1 second
  }
}