#include <LiquidCrystal.h>
#include <HCSR04.h>
#include <Arduino.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
UltraSonicDistanceSensor distanceSensor(10, 9);

void setup (){
  Serial.begin(9600);
  lcd.begin(16, 2);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(13, OUTPUT);
}

void loop(){
  double distance = distanceSensor.measureDistanceCm();
  Serial.println(distance);
  
  if(distance >= 10){
  digitalWrite(8, HIGH);
  }

  if(distance != -1){
  lcd.setCursor(0, 0);
  lcd.print(distance);
  lcd.print("cm");
  delay(400);
  lcd.clear();
  }
    
  if(distance != -1) {
    if(distance <= 20){
      lcd.setCursor(1, 1);
      lcd.print("Achtung!!!");
      }
    }
      
      if(distance != -1){
        if(distance <= 10){
        digitalWrite(8,LOW);
        digitalWrite(7, HIGH);
        digitalWrite(13, HIGH);
        delay(500);
        digitalWrite(7, LOW);
        digitalWrite(13, LOW);
        }
      }
  if(distance = -1.00){
    lcd.clear();

  }
     
     if(distance = -1.00){
    digitalWrite(7, LOW);
    digitalWrite(8, LOW);

   }
}