#include <Wire.h>
#include <LiquidCrystal_I2C.h>    
 LiquidCrystal_I2C lcd(0x27,16,2);   
 int IR1 = 4;  
 int IR2 = 7;   
 int Slot = 4;     
 int motorPin1  = 8;
 int motorPin2 = 9 ;
 int motorPin3 = 10;
 int motorPin4 = 11;
 void setup()  
 {  
  lcd.init();      
  lcd.backlight();  
  pinMode(motorPin1, OUTPUT);
  pinMode(motorPin2, OUTPUT);
  pinMode(motorPin3, OUTPUT);
  pinMode(motorPin4, OUTPUT);
 pinMode(IR1, INPUT);  
 pinMode(IR2, INPUT);    
 lcd.setCursor (0,0);  
 lcd.print("   smart  ");  
 lcd.setCursor (0,1);  
 lcd.print(" carpark ");  
 delay (2000);  
 lcd.clear();   
 }  
 void loop(){   
  if(digitalRead(IR1)==LOW)
 }