/*
 * Created by ArduinoGetStarted, https://arduinogetstarted.com
 *
 * Arduino - Ultrasonic Sensor HC-SR04
 *
 * Wiring: Ultrasonic Sensor -> Arduino:
 * - VCC  -> 5VDC
 * - TRIG -> Pin 9
 * - ECHO -> Pin 8
 * - GND  -> GND
 *
 * Tutorial is available here: https://arduinogetstarted.com/tutorials/arduino-ultrasonic-sensor
 * Hannu Liedes 
 */

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display


int trigPin = 10;    // TRIG pin
int echoPin = 1;    // ECHO pin

float duration_us, distance_cm;

void setup() {

  // configure the trigger pin to output mode
  pinMode(trigPin, OUTPUT);
  // configure the echo pin to input mode
  pinMode(echoPin, INPUT);

    lcd.init();                      // initialize the lcd 
      // Print a message to the LCD.
    lcd.backlight();
   
  
}

void loop() {
  // generate 10-microsecond pulse to TRIG pin
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(100);
  digitalWrite(trigPin, LOW);

  // measure duration of pulse from ECHO pin
  duration_us = pulseIn(echoPin, HIGH);

  // calculate the distance
  distance_cm = 0.017 * duration_us;

 // print distance to LCD display
  lcd.setCursor(0,0);
  lcd.print("Distance: ");
  lcd.setCursor(0,1);
  lcd.print(distance_cm);
   lcd.setCursor(0,2);
  lcd.print("Hannu Liedes");
   lcd.setCursor(2,3);
  lcd.print("Fab Lab Oulu");


  delay(500);
}