#include<Servo.h>  //adding Servo library
Servo gate;        //you may open or close gate using a Servo motor
int slot1 = 5;   //Connect IR sensor on digital pin5 for sLOT 1
int slot2 = 4;   //sLot2 pin on digital 4 
int gateSensor = 3; //IR sensor on gate to arduino pin 3
int slot1_l = 13;
int slot2_l = 12;
int gate_grn = 11;
int gate_red = 10;

void setup() 
{
 gate.attach(7);     //connecting the gate servo on pin 5
 pinMode(slot1,INPUT);  //setting slot pins  & gate IR sensor as input to arduino
 pinMode(slot2,INPUT);
 pinMode(gateSensor,INPUT);
 pinMode(slot1_l,OUTPUT);
 pinMode(slot2_l,OUTPUT);
 pinMode(gate_grn,OUTPUT);
 pinMode(gate_red,OUTPUT);
 Serial.begin(9600);       //initialzing Serial monitor

}

void loop() 
{
     //the car arrives and sensor goes LOW

    if(   !(digitalRead(gateSensor)) && digitalRead(slot1) && digitalRead(slot2))   //slot1 & slot2 empty
     {
      Serial.println("Welcome, Available: sLOT1, sLOT2");  //print slot1 and slo2 available
      digitalWrite(slot1_l,HIGH);
      digitalWrite(slot2_l,HIGH);
      delay(1000);
      digitalWrite(gate_grn,HIGH);

       gate.write(75); //gate will open after the dealy of 1 second

     }

     if( !(digitalRead(gateSensor)) && !(digitalRead(slot1)) && digitalRead(slot2))  //car on slot1,slot2 free
      {
          Serial.println("Welcome, Available: sLOT2");  // slo2 available
          digitalWrite(slot1_l,LOW);
          digitalWrite(slot2_l,HIGH);
          delay(1000);
          digitalWrite(gate_grn,HIGH);
         gate.write(75); //gate will open after the dealy of 1 second
      }
      
       if( !(digitalRead(gateSensor)) && digitalRead(slot1) && !(digitalRead(slot2)))     //car on slot2,slot1 free
       {
         Serial.println("Welcome, Available: sLOT1");  // slo1 available
          digitalWrite(slot1_l,HIGH);
          digitalWrite(slot2_l,LOW);
          delay(1000);
         digitalWrite(gate_grn,HIGH);
         gate.write(75); 
          delay(100);                //gate will open after the dealy of 1 second
       }
      

        if( !(digitalRead(gateSensor)) && !(digitalRead(slot1)) && !(digitalRead(slot2)))
         {
           Serial.println("Welcome, Parking Full");// No slot available
            digitalWrite(slot1_l,LOW);
            digitalWrite(slot2_l,LOW);
            delay(1000);
            digitalWrite(gate_red,HIGH);
            delay(100);
            digitalWrite(gate_red,LOW);
            delay(100);
            digitalWrite(gate_red,HIGH);
            delay(100);
            digitalWrite(gate_red,LOW);
            
            
         }
            
  if( digitalRead(gateSensor))
        { Serial.println("Welcome");  // slo2 available
          gate.write(5);       //gate close
         digitalWrite(slot1_l,LOW);
         digitalWrite(slot2_l,LOW);
         digitalWrite(gate_red,LOW);
         digitalWrite(gate_grn,HIGH);
         delay(100);
         digitalWrite(gate_grn,LOW);
         delay(100);
         
        
        }
  
}