#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);

const int trigPin = 5;
const int echoPin = 18;

// define sound speed in cm/uS
#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701

long duration;
float distanceCm;
float distanceInch;

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.setCursor(2,0);
  lcd.println("Sensor Jarak");
  delay(200);
  lcd.setCursor(4,1);
  lcd.println("by imas");
  delay(2000);
  lcd.clear();
   
  Serial.begin(115200); // starts the serial communication
  pinMode(trigPin, OUTPUT); // sets the trigPin as an Output
  pinMode(echoPin, INPUT); // sets the echoPin as an Input
}

void loop() {
  // clears the trigPin 
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(2);

  // sets the trigPin on HIGH state for 10 microseconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Reads the echoPin,returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin,HIGH);

  // calculate the distance
  distanceCm = duration*SOUND_SPEED/2;

  // convert to inches
  distanceInch = distanceCm*CM_TO_INCH;

  // Prints the distance in the serial monitor
  Serial.print("Distance (cm): ");
  Serial.println(distanceCm);
  Serial.print("Distance (inch): ");
  Serial.println(distanceInch);
  delay(1000);

  lcd.setCursor(4,0);
  lcd.println("Jarak :");
  lcd.setCursor(2,1);
  lcd.println(String (distanceInch) + " inch");
  delay(1000);
  
}