#include <LiquidCrystal_I2C.h>
#define echoPin 2 // define = membuat konstanta
#define trigPin 3
long duration; //long = menampung angka yg lbh besar
int distance; //menyimpan jarak
LiquidCrystal_I2C lcd(0x27, 16, 2);
void setup() {
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
lcd.init();
lcd.backlight();
lcd.println("Sensor HC-SR04"); //hny utk menampilkan tulisan
}
void loop() {
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = duration * 0.034 / 2; //rumus menghitung jarak
lcd.setCursor(0,1);
lcd.print("Distance: ");
lcd.print(distance);
lcd.println(" cm");
}