#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);
const int trigger=9;
const int echo=10;
const int buzzer=11;
const int led=13;

void setup() {
  // put your setup code here, to run once:
pinMode(trigger, OUTPUT);
pinMode(echo, INPUT);
pinMode(buzzer, OUTPUT);
pinMode(led, OUTPUT);
Serial.begin(9600);

lcd.init();
lcd.backlight();

}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(trigger, LOW);
delayMicroseconds(5);

digitalWrite(trigger, HIGH);
delayMicroseconds(13);
digitalWrite(trigger, LOW);

long duration = pulseIn(echo,HIGH);

long distance = (duration*0.0343)/2;

Serial.print("sensor distance: ");
Serial.print(distance);

if (distance < 100) {
  tone(buzzer,10);
} else{
  noTone(buzzer);
}
if (distance > 1000){
  digitalWrite(led, HIGH);

}
else{
  lcd.setCursor(0,0);
  lcd.print("Distance");
  lcd.setCursor(0,1);
  lcd.print(distance);

  delay(1000);
}
}