#include <IRremote.h>

// define the GPIO connected with Relays
#define RelayPin1 2 //D2
#define RelayPin2 3  //D3
#define RelayPin3 4  //D4

#define IR_RECV_PIN A0  //A0

//Update the HEX code of IR Remote 0x<HEX CODE>
#define IR_Button_1   48  
#define IR_Button_2   24
#define IR_Button_3   122
#define IR_All_Off    176
#define IR_All_On     104

void relayOnOff(int relay){
 switch(relay){
      case 1:
            digitalWrite(RelayPin1, !digitalRead(RelayPin1)); // change state for relay-1
            delay(100);
            
      break;
      case 2:
            digitalWrite(RelayPin2,  !digitalRead(RelayPin2)); // change state for relay-2
            delay(100);
      break;
      case 3:
            digitalWrite(RelayPin3,  !digitalRead(RelayPin3)); // change state for relay-3
            delay(100);
      break;
      default : break;      
      }  
}

void all_Switch_OFF(){
  digitalWrite(RelayPin1, LOW);  delay(100);
  digitalWrite(RelayPin2, LOW);  delay(100);
  digitalWrite(RelayPin3, LOW);  delay(100);
}

void all_Switch_ON(){
  digitalWrite(RelayPin1, HIGH);  delay(100);
  digitalWrite(RelayPin2, HIGH);  delay(100);
  digitalWrite(RelayPin3, HIGH);  delay(100);
}

void ir_remote(){
  if (IrReceiver.decode()) {
    Serial.println(IrReceiver.decodedIRData.command);
    
      switch(IrReceiver.decodedIRData.command){
        
          case IR_Button_1:  relayOnOff(1);     break;
          case IR_Button_2:  relayOnOff(2);     break;
          case IR_Button_3:  relayOnOff(3);     break;
          case IR_All_Off:   all_Switch_OFF();  break;
          case IR_All_On:    all_Switch_ON();   break;
          default : break;         
        }   
        
        IrReceiver.resume();
  } 
}

void setup() {
  Serial.begin(9600);

  IrReceiver.begin(IR_RECV_PIN);// Start the receiver

  pinMode(RelayPin1, OUTPUT);
  pinMode(RelayPin2, OUTPUT);
  pinMode(RelayPin3, OUTPUT);

  //During Starting all Relays should TURN OFF
  digitalWrite(RelayPin1, LOW);
  digitalWrite(RelayPin2, LOW);
  digitalWrite(RelayPin3, LOW);
  delay(500);
}

void loop() {

  ir_remote();

}