// LCD1602 to Arduino Uno connection example

#include <LiquidCrystal.h> //LCD library
int val = 0; //creating an integer 
LiquidCrystal lcd(12, 11, 10, 9, 8, 7); //LCD setup

void setup() {
  lcd.begin(16, 2); 
  // you can now interact with the LCD, e.g.:
  lcd.print("Hello World!"); //first LCD message
  pinMode(4,INPUT); //setting pin 4 (PIR sensor) as input
  pinMode(6,OUTPUT); //setting pin 6 (Buzzer) as output
  pinMode(13,OUTPUT); //setting pin 13 (LED) as output
}

void loop() {
  // ...
  val = digitalRead(4); //measuring the input of pin 4
if (val==HIGH) { //if the PIR detects motion
    digitalWrite(13,HIGH); //light the LED
    tone(6,100); //activates the buzzer
    lcd.home(); //prevents repetition
    lcd.print("HEART ATTACK "); //prints on the LCD
    delay(100); //waits for a millesecond
  }
else { //if the PIR doesn't detect motion
    digitalWrite(13,LOW); //turns off the LED
    noTone(6); //turns off the buzzer
    lcd.home();
    lcd.print("heart is safe");
    delay(200);
  }


}