#include <IRremote.h>

#define PIN_RECEIVER A0
IRrecv receiver(PIN_RECEIVER);

const int infrared_Sensor_1 = 10;
const int infrared_Sensor_2 = 11;
const int red_LED_1 = 9;
const int green_LED_2 = 8;

int infrared_State_1;
int infrared_State_2;

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

  pinMode(infrared_Sensor_1, INPUT);
  pinMode(infrared_Sensor_2, INPUT);
  pinMode(red_LED_1, OUTPUT);  
  pinMode(green_LED_2, OUTPUT);

  for(int i=4;i<=7;i++) pinMode(i,OUTPUT);
}

void loop()
{ if (receiver.decode()) 
  { Kereta();
    receiver.resume(); 
  }

  infrared_State_1 = digitalRead(infrared_Sensor_1);
  infrared_State_2 = digitalRead(infrared_Sensor_2);

  if (infrared_State_1 == HIGH && infrared_State_2 == HIGH) 
  { digitalWrite(green_LED_2, LOW);
    digitalWrite(red_LED_1, HIGH);
  }
  else  
  { digitalWrite(green_LED_2, HIGH);
    digitalWrite(red_LED_1, LOW);
  }
}

void Kereta()
{ Serial.print("IRData: ");
  Serial.print(receiver.decodedIRData.command);
  switch (receiver.decodedIRData.command) {
    case 2:
      Serial.println("\tFWD");
      Forward();
      break;
    case 152:
      Serial.println("\tRVS");
      Back();
      break;
    case 224:
      Serial.println("\tLEFT");
      Left();
      break;
    case 168:
      Serial.println("\tSTOP");
      Stop();
      break;
    case 144:
      Serial.println("\tRIGHT");
      Right();
      break;
    default:
      Serial.println("\tother button");
  }
}
void Back()
{ digitalWrite(7, HIGH);
  digitalWrite(6, LOW);
  digitalWrite(5, HIGH);
  digitalWrite(4, LOW );        
}
void Forward()
{ digitalWrite(4, HIGH);
  digitalWrite(5, HIGH);
  digitalWrite(6, HIGH);
  digitalWrite(7, HIGH);        
}    
void Left()
{ digitalWrite(4, HIGH);
  digitalWrite(5, HIGH);
  digitalWrite(6, LOW);
  for(int i=100;i<=300;i=i+100) delay(i);
}
void Right()
{ digitalWrite(6, HIGH);
  digitalWrite(7, HIGH);
  digitalWrite(4, LOW);
  for(int j=100;j<=300;j=j+100) delay(j);
} 
void Stop()
{ digitalWrite(4, LOW);
  digitalWrite(5, LOW);
  digitalWrite(6, LOW);
  digitalWrite(7, LOW); 
}