#include <LiquidCrystal.h>
const int trigPin = 18;
const int echoPin = 5;
const int buzzerPin = 4; 

long duration;
int distance;
LiquidCrystal lcd(26, 25,2, 15, 22,23);
void setup() {
  Serial.begin(9600);

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(12, OUTPUT);


  lcd.begin(16, 2);
}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

 
  duration = pulseIn(echoPin, HIGH);

  
  distance = duration * 0.034 / 2;

 
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  if (distance < 100) {
    
    digitalWrite(buzzerPin, HIGH);
    playTone(buzzerPin, 1000, 2000);
    digitalWrite(12, HIGH);
    delay(200);
    digitalWrite(12, LOW);
    delay(1000);
   lcd.setCursor(0, 0);
  lcd.print("Distance is less than 100cm");  
  lcd.autoscroll();
  delay(70);
  


  } else {
   
    digitalWrite(buzzerPin, LOW);
     lcd.setCursor(0, 0);
  lcd.print("Distance is more than 100cm");  
  lcd.autoscroll();
  delay(70);
  }

 
  delay(1000); 

}
void playTone(int pin, int frequency, int duration) {
  tone(pin, frequency); 
  delay(duration);      
  noTone(pin);       }   








// 
//  // RS, E, D4, D5, D6, D7

// void setup() {
//   Serial.begin(9600);
//   Serial.println("Hello, ESP32!");
//   lcd.begin(16, 2);
//   lcd.print("Hello World Himashu!");
//   lcd.setCursor(0, 1);

// delay(5000);
// }

// void loop() {
//   lcd.autoscroll();
  
// }