#define echoPin 4 //Echo Pin
#define trigPin 7 //Trigger Pin
#include  <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20,4);  

float duration, distance; 

void setup() {
Serial.begin (9600); 
//pin declarations
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  lcd.begin();
  lcd.backlight();
  delay(50);
  lcd.noBacklight();
  delay(50);
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Fablab Kamakura");
  delay(500);
  lcd.setCursor(0,1);
  lcd.print("Setyawan UGM");
  delay(500);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Sensor HC-SR04 Test");
}

void loop() {
  digitalWrite(trigPin, LOW);delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration/58.2; //calculation of distance
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  lcd.setCursor(0,2);
  lcd.print("Distance(cm):");
  lcd.setCursor(13,2);
  lcd.print(distance);
  delay(200);
  Serial.println();
}