#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27,16,2);

#define TRIGGER_PIN 26
#define ECHO_PIN 27
#define BUZZ 33

float dis = (TRIGGER_PIN+ECHO_PIN)*0.34;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  LCD.init();
  LCD.backlight();
  LCD.begin(0,0);
  LCD.clear();
  
  LCD.print("Distance Meter");

pinMode(TRIGGER_PIN, OUTPUT);
pinMode(ECHO_PIN, INPUT);
pinMode(BUZZ, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
if(dis<=40){
  digitalWrite(BUZZ, HIGH);
  tone(BUZZ,1500,250);
  delay(500);
  LCD.begin(0,1);
  LCD.print(String(dis) + "cm");
}
else if(dis<=80){
  digitalWrite(BUZZ, HIGH);
  tone(BUZZ,1200,250);
  delay(600);
  LCD.begin(0,1);
  LCD.print(String(dis) + "cm");
}
else if(dis<=100){
  digitalWrite(BUZZ, HIGH);
  tone(BUZZ,1000,250);
  delay(1000);
  LCD.begin(0,1);
  LCD.print(String(dis) + "cm");
}


}