Passive Infra-Red sensor with LCD

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This is my first project in blog and i am gonna so you how to interface Passive Infra-Red (PIR) sensor with Arduino UNO R3 and 16*2 LCD.
Hope you know whats PIR sensor is because i am not discussing  about PIR sensor, LCD and the main brain of this project the Arduino.
Ok lets start from pin to pin.

LCD PIN TO ARDUINO PINS:
 * LCD RS pin to digital pin 12
 * LCD Enable pin to digital pin 11
 * LCD D4 pin to digital pin 5
 * LCD D5 pin to digital pin 4
 * LCD D6 pin to digital pin 3
 * LCD D7 pin to digital pin 2
 * LCD R/W pin to ground
 * LCD VSS pin to ground
 * LCD VCC pin to 5V
 * 10K resistor:
 * ends to +5V and ground
 * wiper to LCD VO pin (pin 3)

NEXT PIR PIN TO ARDUINO PINS:
 *VCC TO 5V
 *GND TO GND
 *OUTPUT(OUT) TO digital pin 7

Ok lets look the circuit in bread-board.

CODE:
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
const int LED = 13;
const int PIR = 7;
int state = 0;
int calibrationTime = 0;        
void setup() {
  lcd.begin(16,2);
  pinMode(LED, OUTPUT);
  pinMode(PIR, INPUT);
  lcd.print("LOADING");
  delay(2000);
  lcd.clear();
    for(int i = 10; i > calibrationTime; i--){
       lcd.setCursor(8,0);
      lcd.print(i);
      delay(1000);
      lcd.clear();
      }
    lcd.setCursor(0,0);
    lcd.print("DEVICE");
    lcd.setCursor(0,1);
    lcd.print("ACTIVE");
    delay(2000);
    lcd.clear();
  }
void loop() {
  state = digitalRead(PIR);
  if (state==HIGH) {
    digitalWrite(LED, HIGH);
    lcd.print("SOMEBODY IS IN YOUR ROOM");
    delay(1000);
    for (int positionCounter = 0; positionCounter < 9; positionCounter++)
    lcd.scrollDisplayLeft();
    delay(1500);
    lcd.clear();
  } else {
    digitalWrite(LED, LOW);
    lcd.print("NO ONE IS IN YOUR ROOM");
    delay(1000);
    for (int positionCounter = 0; positionCounter < 9; positionCounter++)
    lcd.scrollDisplayLeft();
    delay(1500);
    lcd.clear();
  }

}

Hope you that you are the genius one so i haven't written comments in this code. 

 For the video click the following link

https://www.youtube.com/watch?v=1R9F92_I5hg&feature=youtu.be


By the way this is my first project so i am not writing anymore then this and mainly learn the concept of this code not to save in mind without knowing anything.

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