#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

long bacaJarak (int triggerPin, int echoPin){
  pinMode(triggerPin, OUTPUT);
  digitalWrite(triggerPin, LOW);
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(19);
  digitalWrite(triggerPin, LOW);
  pinMode(echoPin, INPUT);
  return pulseIn(echoPin, HIGH);
}

void setup() {
  Serial.begin(9600);
  // inisialisasi lcd
  lcd.init();
  lcd.backlight();
}

void loop() {
  //pembacaan ultrasonik
  int cm = 0;
  cm = (0.03446 * bacaJarak(7, 8))/2;
  int mm = cm*100;
  // menampilkan pembacaan sensor ke monitor
  Serial.print(cm);
  Serial.println("cm");
  // menampilkan pembacaan sensor ke lcd
  lcd.setCursor(0,0);
  lcd.print("Jarak: ");
  lcd.print(cm);
  delay(1000);
}