//YWROBOT
//Compatible with the Arduino IDE 1.0
//Library version:1.1
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x27 for a 16 chars and 2 line display

void setup()
{
  pinMode (4,INPUT_PULLUP);
  pinMode(5, OUTPUT);
  lcd.init();                      // initialize the lcd 
  lcd.init();
  // Print a message to the LCD.
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Car Park");
  lcd.setCursor(0,1);
  lcd.print("PTSS");
  delay(1000);
  lcd.clear();
}

  int a=5;
void loop()
{
  //Read button State
  int buttonState = digitalRead(4);
  //Check button State
  if(buttonState == LOW){
     //if press then a = a - 1
     if (a > 0){
     a = a - 1;
     //Display LCD
     lcd.clear();
     lcd.setCursor(7,0);
     lcd.print(a);
     delay(500);
     }
  } 
  if (a == 0){
    lcd.setCursor(6,1);
    lcd.print("FULL");
    blink();
  }
}

void blink(void){
  digitalWrite(5, HIGH);
  delay(300);
  digitalWrite(5, LOW);
  delay(300);
}