#include <LiquidCrystal_I2C.h> //library for better communication with

// set the LCD number of columns and rows
int lcdColumns = 16;           //allows display of text with 16 characters
int lcdRows = 2;               //allows display of text 2 rows
int ledPin = 23;               // choose the pin for the LED
int buzzPin = 18;              // choose the pin for the buzzer
int inputPin = 19;             // choose the input pin (for PIR sensor)
int pirState = LOW;            // we start, assuming no motion detection
int val = 0;                   // variable for reading the pin status

// set LCD address, number of columns and rows
//if you don't know your display address, run an I2C scanner sketch
LiquidCrystal_I2C  lcd(0x27, lcdColumns, lcdRows);

void setup() {
  pinMode(buzzPin, OUTPUT);    // declare buzzer as output
  pinMode(ledPin, OUTPUT);     // declare LED as output
  pinMode(inputPin, INPUT);    // declare sensor as input
  //  intialize LCD
  lcd.init();
  //  turn on LCD backlight
  lcd.backlight();
}

void loop() {
  val = digitalRead(inputPin); // read input value 
  if(val == HIGH){             // check if the input is HIGH
      digitalWrite(ledPin, LOW); // turn LED off
      digitalWrite(buzzPin, HIGH); // turn buzz ON
      tone(buzzPin, 100, 6000);  //pin number, frequency, duration

      //to display the status in the LCD
      // set cursor to first column, first row
      lcd.setCursor(0,0);
      // print message
      lcd.print("Motion Detected.");
      delay(3000);
      // clears the display to print new message
      lcd.clear();
      //  we only want to print on the output change, not state
      //  set cursor to first column, second row
      lcd.setCursor(0, 1);
      lcd.print("Area is not safe!");
      delay(3000);
      lcd.clear();
      pirState = HIGH;
  }

  else{
      digitalWrite(ledPin, HIGH); // turn LED on
      digitalWrite(buzzPin, LOW); // turn LED off

      // set cursor to first column, first row
      lcd.setCursor(0, 0);
      // print message
      lcd.print("No motion sensed.");
      delay(3000); 
        // clears the display to print new message
      lcd.clear();
        // We only want to print on the output change, not state
        //set cursor to first column, second row
      lcd.setCursor(0, 1);
      lcd.print("Area is safe!");
      delay(3000);
      lcd.clear();
      pirState = LOW;    
  }
}