#include <LiquidCrystal_I2C.h>
#define ECHO_PIN 2
#define TRIG_PIN 3
#define LED_BUILTIN 13
LiquidCrystal_I2C lcd(0x27,20,4);

void setup() {
  // put your setup code here, to run once:
pinMode (LED_BUILTIN, OUTPUT);
pinMode (TRIG_PIN, OUTPUT);
pinMode (ECHO_PIN, INPUT);
Serial.begin(9600);
lcd.init();
lcd.backlight();
lcd.print("--- J A R A K ---");
delay(3000);
lcd.clear();

}

float jarak_cm()
{
  digitalWrite (TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite (TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite (TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;
}
float jarak_int()
{
  digitalWrite (TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite (TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite (TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return (duration * 0.034 / 2) / 2.254;
}

void loop() {
  // put your main code here, to run repeatedly:
float cm = jarak_cm();
float IN = jarak_int();
bool isNearby = cm < 100;
digitalWrite (LED_BUILTIN, isNearby);
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Inches");
lcd.setCursor(4,0);
lcd.setCursor(12,0);
lcd.print("cm");
lcd.setCursor(1,1);
lcd.print(IN,1);
lcd.setCursor(11,1);
lcd.print(cm,1);
lcd.setCursor(14,1);
delay(1000);
lcd.clear();

delay(100);
}