/****************************************
  Pengukur jarak dengan sensor Ultrasonik
  HC-SR04   |   Arduino UNO
  ---------------------------
  Vcc       |   5V
  Gnd       |   GND
  TRIG      |   2
  ECHO      |   3
  www.ardutech.com
*****************************************/

#include <LiquidCrystal_I2C.h>            //Library lcd
LiquidCrystal_I2C lcd(0x27, 20, 4);

int trig_pin = 2;
int echo_pin = 3;
long echotime; 
float jarak;
float inci;
float meter;
float kaki;

void setup() {
  Serial.begin(9600);
  pinMode(trig_pin, OUTPUT); 
  pinMode(echo_pin, INPUT);
  digitalWrite(trig_pin, LOW); 

  lcd.init();
  lcd.backlight();
  lcd.clear();

  lcd.setCursor(1, 0);
  lcd.print("TERMOMETER DIGITAL");
  lcd.setCursor(3, 1);
  lcd.print("EMPAT SKALA");
  lcd.setCursor(2, 2);
  lcd.print("OLEH KELOMPOK 1");
  lcd.setCursor(0, 3);
  lcd.print("HOLIS, NIA, dan NISA");
  delay(500); 
}

void loop() {
  digitalWrite(trig_pin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig_pin, LOW);
  echotime= pulseIn(echo_pin, HIGH);
  jarak= 0.0001*((float)echotime*340.0)/2.0;
  //break
  inci = jarak / 2,54;
  meter = jarak / 100;
  kaki = jarak / 30,48;
  //break
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(jarak);
  lcd.print(" cm"); 

  lcd.setCursor(0, 1);
  lcd.print(inci);
  lcd.print(" inci"); 

  lcd.setCursor(0, 2);
  lcd.print(kaki);
  lcd.print(" kaki"); 
  
  lcd.setCursor(0, 3);
  lcd.print(meter);
  lcd.print(" m");  
  delay(500);
}