#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() {
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(led, OUTPUT);
  Serial.begin(9600);


   lcd.init(); // Initialize the LCD
  lcd.backlight(); // Turn on the backlight
}
void loop() {
  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.println(distance);

  if (distance < 75) {
    tone(buzzer, 1000);
  } else {
  noTone(buzzer);
  }
  if(distance>75){
digitalWrite(led, HIGH);
 
  }
  else{

  digitalWrite(led, LOW);
}
  lcd.setCursor(0, 0);
 lcd.print("distance");
 lcd.setCursor(0, 1);
 lcd.print(distance);

 delay(500);
}