#define SENSOR 9
#define BUZZER 13
//Defines each pin as a word 
#include <LiquidCrystal_I2C.h>
//Set to insure lots of code doesn't need to be included 

LiquidCrystal_I2C lcd(0x27, 20, 4);
//Sets rows into different collums 

void setup() {
  // put your setup code here, to run once:
  pinMode(13, OUTPUT);
  pinMode(9, INPUT);
  //lets the board know what pin is an input and output
  lcd.init();
  lcd.backlight();
  //Lights up the screen so code is able to be seen 
}

void loop() 
{
  // put your main code here, to run repeatedly:
 int state = digitalRead(9);
    if (state == HIGH)
    //Tells board that motion is detected 
    {
      digitalWrite(13, HIGH);
      //informs that motion was detected so buzzer starts buzzing
      tone(BUZZER, 100);
      //allows board to know what tone the buzzer should be at
      lcd.setCursor(0,0);
      lcd.print("Motion has been");
      lcd.setCursor(2,1);
      lcd.print("detected");
      //lets the board know what to right on screen 
      //and where to position text 
      delay(1000);
      lcd.init();
      //Erases text from screen 
    }
    if (state == LOW)
    //indetify motions not detected 
    {
      digitalWrite(13, LOW);
      //if motion not detected then buzzer doesn't go
      noTone(BUZZER);
      //Informs that buzzer shouldn't have a tone so it's not going 
      lcd.init();
    }

}