//import lcd libary:
#include <LiquidCrystal.h>
//variabels for pins in arduino chip:
int TrigPin = 9;
int EchoPin = 10;

//distance reading variabels:
long Duratation;
int Distance;
int NewDistance;
int Speed;
int v1;
int v2;
unsigned long time;

// initialize the library by associating any needed LCD interface pin
// with the arduino pin number it is connected to
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
unsigned long startMillis;
unsigned long currentMillis;
const unsigned long period = 5000;

void setup()
{
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);

  //input signal and output signal to read distance:
  pinMode(TrigPin, OUTPUT);
  pinMode(EchoPin, INPUT);
  pinMode(12, INPUT);
  digitalWrite(12, HIGH);
  // ger bit värde och printar på displayn
  Serial.begin(9600);
  lcd.print("Distance: ");
  lcd.setCursor(0, 1);
  lcd.print("Speed: ");

  //9600 bit comunication from pc to arduino:

  //--------------------LCD_DISPLAY---------------------'
}

void loop()
{
  //skickar ut signal genom sensorn och väntar 2 milli secunder.
  digitalWrite(TrigPin, LOW);
  delayMicroseconds(2);

  //skickar ut echo signal tillbaks genom sensorn och väntar 2 milli secunder.
  digitalWrite(TrigPin, HIGH);
  delayMicroseconds(5);

  //omvandlar "Duratation" variablen till värdet av signalen av sensorn man får in för att få ut avståndet
  Duratation = pulseIn(EchoPin, HIGH);
  //omvändlar avståndet till centimeter
  Distance = (Duratation / 2 * 0.034);
  //väntar 0.18 sekunder
  delay(180);


  //--------------------LCD_DISPLAY---------------------
  //print speed and distance on lcd display:


}