#include <NewPing.h>             //fuer Ultraschall-Sensor
#include <Wire.h>                //fuer I2C Kommunikation  
#include <LiquidCrystal.h>       //LCD
#include <DHT.h>
#include <GyverMAX7219.h>

#define LEVELFULL 35  //Hoehe Wassersaeule wenn voll (=100%) in cm
#define LEVELEMPTY 40 //Abstand Boden zu Sensor in cm
#define VOLUME 80   //Volumen des zu messenden Mediums bei 100% in l
#define trigPin  2        // Trigger Pin
#define echoPin  3        // Echo Pin
#define MAX_DISTANCE 320  // Begrenzung fuer Ultraschallsensor
#define DHTPIN 4
#define DHTTYPE DHT22
#define TIMEDHT 1000
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
DHT dht(DHTPIN, DHTTYPE);

float duration;
float humidity, celsius, fahrenheit;
int lefty, distance, levelact, levelpercent, volumeact;

NewPing sonar(trigPin, echoPin, MAX_DISTANCE); // NewPing Setup

void setup() {
  Serial.begin(9600); // nur fuer Debugzwecke
  lcd.begin(16, 2);
  lcd.clear();
  lcd.print("  GEAR_SHREDDER");
  lcd.setCursor(0, 1);
  lcd.print(" CONTROLL PANEL"); 
  
}

void loop() {
  delay(2000); // Wartezeit zwischen Pings (ca. 20 pings/sec). nicht kleiner als 29ms! 
  dht.begin();
  //Messung mit Mittelung
  int iterations = 5;
  duration = sonar.ping_median(iterations);      //duration = sonar.ping() ohne Mittelung
  distance = int((duration / 2) * 0.0343);       //Abstand in cm

  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  humidity = dht.readHumidity();

  // Read temperature as Celsius (the default)
  celsius = dht.readTemperature();

  //Fuellstand berechnen
  levelact = (LEVELEMPTY - distance);

  //Fuellstand in Prozent berechnen
  levelpercent = (levelact * 100 / LEVELFULL);
  
  //Berechnung Volumen
  volumeact = ((VOLUME / 100) * levelpercent);
  
  levelpercent = constrain(levelpercent, 0, 100);  //um nur Werte zwischen 0 und 100 zu erhalten
  
  //Display anzeigen#
  lcd.clear();
  lcd.print("  Wasser: ");
  lcd.print(levelpercent);
  lcd.print("%");
  lcd.setCursor(0, 1);
  lcd.print(celsius);
  lcd.print("C   ");
  lcd.print(humidity);
  lcd.print("%");
}