#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);
#define PIR_PIN 13
#define BUZZ_PIN 7
#define NOTE_C1 104
#define LED 2
void setup() {
  pinMode(PIR_PIN, INPUT);
  pinMode(BUZZ_PIN, OUTPUT);
  pinMode(LED, OUTPUT);
  lcd.init();
  lcd.backlight();
  // Serial.begin(9600);
}
void alert(){
  digitalWrite(LED, HIGH);
  delay(100);
  digitalWrite(LED, LOW);
  delay(100);
}
void loop() {
  int motionDetect = digitalRead(PIR_PIN);
  if (motionDetect == HIGH){
    digitalWrite(BUZZ_PIN, HIGH);
    tone(BUZZ_PIN, NOTE_C1, 200);
    // Serial.println("motion detected");
    alert();
    lcd.setCursor(4, 0);
    lcd.print("Alert!");
  }
  else{
    digitalWrite(BUZZ_PIN, LOW);
    lcd.setCursor(4, 0);
    lcd.print("safe        ");
    // Serial.println("no motion");
  }
  delay(50);
}