#define ECHO_pin 3
#define TRIG_pin 4
#define pinBuzzer 5
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);

void setup() {
pinMode (ECHO_pin, INPUT);
pinMode (TRIG_pin, OUTPUT);
Serial.begin(9600);
lcd.init();
lcd.backlight();
}

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

long duration, distance;
 duration = pulseIn(ECHO_pin, HIGH);
 distance = duration*0.03425/2;
 Serial.println(distance);

lcd.setCursor(0,0);
lcd.print("Jarak :");
lcd.setCursor(7,0);
lcd.print(distance);
delay(1000);

if(distance < 100){
  tone(pinBuzzer, 264, 100);
}else if(distance > 101 && distance < 300 ){
  tone(pinBuzzer, 297, 100);
}else if(distance > 331 ){
    tone(pinBuzzer, 330, 100);
}
delay(100);

 int data=0;
 lcd.setCursor(0,1);
  lcd.print("rizal kurniawan");
  delay(1000);
  //lcd.clear();

//lcd.setCursor(0,1);
  //lcd.print("kelas fl 3.2");
  //delay(1000);
 // lcd.clear();

//lcd.setCursor(0,1);
  //lcd.print("absen 32");
  //delay(1000);
  //lcd.clear();
  


}