#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#include <HCSR04.h>

LiquidCrystal_I2C lcd(0x27,20,4);

const int Trig=11;
const int Echo=10;

UltraSonicDistanceSensor uSensor(Trig,Echo,410,24000);    //410cm und 24µs

float duration=0;     //Dauer bis Echo kommt
float temp=30.8;      //Lufttemperatur 
float c=0;            //Schallgeschwindigkeit

void setup() {
  lcd.begin(20,4);
  lcd.backlight();
  lcd.setCursor(1,0);
  lcd.print("Ultraschallsensor");
  lcd.setCursor(8,1);
  lcd.print("Anna");
  delay(3000);
  lcd.clear();

  pinMode(Trig,OUTPUT);
  pinMode(Echo,INPUT);
  Serial.begin(9600);
}

void loop() {
  digitalWrite(Trig,LOW);
  delayMicroseconds(2);
  digitalWrite(Trig,HIGH);
  delayMicroseconds(10);
  digitalWrite(Trig,LOW);
  duration = pulseIn(Echo,HIGH,24000);

  c= 331.5+0.6*temp;

  duration = duration*c/20000;
  /*Serial.print(duration);
  Serial.print(" ");*/

  lcd.setCursor(0,0);
  lcd.println(duration,2);
  delay(200);

  duration = uSensor.measureDistanceCm(0.0);
  lcd.setCursor(0,1);
  lcd.println(duration,2);
  delay(200);
}