#include <LiquidCrystal.h>;
const int trigPin = 2;
const int echoPin = 3;
const int buzzer = 7;
LiquidCrystal LCD(13, 12, 11, 10, 9, 8);

long duration;
int distance;
int safetyDistance;


void setup() {
  pinMode(trigPin, OUTPUT); 
  pinMode(echoPin, INPUT); 
  pinMode(buzzer, OUTPUT);
  LCD.begin(16, 2);
  LCD.print("Distance:");

  Serial.begin(9600); 
}


void loop() {
  // Clears the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);


  duration = pulseIn(echoPin, HIGH);

  distance = duration * 0.034 / 2;

  safetyDistance = distance;
  if (safetyDistance <= 50) {
    digitalWrite(buzzer, HIGH);

  }
  else {
    digitalWrite(buzzer, LOW);

  }

  Serial.print("Distance: ");
  Serial.println(distance);
  LCD.setCursor(0, 1); 
  LCD.print(distance);  
  LCD.print(" cm");
}