#include <DHT.h> //Setup Sensoren
#include <DHT_U.h>
#define DHTPIN1 8
#define DHTPIN2 9
#define DHTTYPE DHT22
DHT dht1(DHTPIN1, DHTTYPE);
DHT dht2(DHTPIN2, DHTTYPE);

#include <SD.h> //Setup SD SDK=D13, MOSI=D11, MISO=D12

#include <Wire.h> //Setup LCD
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); //0x3F = Adresse des Displays

const int REL1 = 2; //Pin des Relais
const int REL2 = 3;
int stat1 = 1; //Status-Variable
int stat2 = 1;

float T1 = 0; //Temperatur-Variablen
float T2 = 0;

long logsek = 0;
String logdata1 = "";
String logdata2 = "";

//* **EINSTELLUNGEN** *//
const int mess = 10; //Messintervall in s !!! muss >2 wegen Sensoren
const int schalt = 15*60; //Schaltintervall in s
const int uT = 0; //Abschalt-Temperatur in °C
const int oT = 6; //Einschalt-Temperatur in °C

void setup() {
  //Serial.begin(9600);
//Timer Setup: https://www.instructables.com/id/Arduino-Timer-Interrupts/
  cli();//stop interrupts
  //set timer1 interrupt at 1Hz
  TCCR1A = 0;// set entire TCCR1A register to 0
  TCCR1B = 0;// same for TCCR1B
  TCNT1  = 0;//initialize counter value to 0
  // set compare match register for 1hz increments
  OCR1A = 15624;// = (16*10^6) / (1*1024) - 1 (must be <65536)
  // turn on CTC mode
  TCCR1B |= (1 << WGM12);
  // Set CS10 and CS12 bits for 1024 prescaler
  TCCR1B |= (1 << CS12) | (1 << CS10);  
  // enable timer compare interrupt
  TIMSK1 |= (1 << OCIE1A);
  sei();//allow interrupts

//Sensoren
  dht1.begin(); //Starten der Sensoren
  dht2.begin();
  delay(2000);
  
//LCD
  lcd.begin(16,2); //Starten des LCD, 16 Zeichen, 2 Zeilen
  lcd.backlight(); //Beleuchtung des Displays einschalten
  delay(1000);
  
//Initialsierugn SD
  lcd.setCursor(0,0); //...(Zeichen,Zeile);
  lcd.print("Initialisierung");
  delay(2000);
  if (!SD.begin(4)) { //Initialisiere SD_Karte mit CS auf Pin D4
    lcd.setCursor(0,1);
    lcd.print("fehlgeschlagen!");
    delay(1000);
    return;
  }
  lcd.setCursor(0,1);
  lcd.print("abgeschlossen");
  delay(1000);

  pinMode(REL1, OUTPUT);
  pinMode(REL2, OUTPUT);
  digitalWrite(REL1, HIGH);
  digitalWrite(REL2, HIGH);
  delay(1000);
  digitalWrite(REL1, LOW);
  digitalWrite(REL2, LOW);

  File logfile = SD.open("logTruhe.txt", FILE_WRITE); //Erstelle bzw. öffne log-Datei
  logfile.println("t(min)\tTruhe\tT(°C)\tStatus");
  logfile.close();
}

ISR(TIMER1_COMPA_vect){ //timer1 interrupt 1Hz
  logsek++;
}
  
void loop() {
//Messung, LOG und LCD
  if (logsek%mess == 0){
    T1 = dht1.readTemperature();
    logdata1 = String(logsek) + "\t1\t" + String(T1) + "\t" + String(stat1);
    T2 = dht2.readTemperature();
    logdata2 = String(logsek) + "\t2\t" + String(T2) + "\t" + String(stat2);
    File logfile = SD.open("logTruhe.txt", FILE_WRITE);
    logfile.println(logdata1);
    logfile.println(logdata2);
    logfile.println();
    logfile.close();
  //Serial.println("Messung + String(logsek)");
    //LCD-Anzeige
    lcd.setCursor(0,0); //...(Zeichen,Zeile);
    lcd.print("Truhe1 ");
    lcd.setCursor(7,0);
    lcd.print(String(T1));
    lcd.setCursor(11,0);
    lcd.print("\337C");
    lcd.setCursor(13,0);
    if (stat1 == 1){
      lcd.print(" an"); 
    }
    else{
      lcd.print("aus");
    }
    lcd.setCursor(0,1);
    lcd.print("Truhe2 ");
    lcd.setCursor(7,1);
    lcd.print(String(T2));
    lcd.setCursor(11,1);
    lcd.print("\337C");
    lcd.setCursor(13,1);
    if (stat2 == 1){
      lcd.print(" an");
    }
    else{
      lcd.print("aus");
    }
  delay(999);
  }

//Schaltung
  if (logsek%schalt == 0){
  //Truhe 1
    if (T1 >= oT){
      digitalWrite(REL1, LOW);
      stat1 = 1;
    }
    else {
      if (T1 <= uT){
        digitalWrite(REL1, HIGH);
        stat1 = 0;
      }
    }
  //Truhe 2
    if (T2 >= oT){
      digitalWrite(REL2, LOW);
      stat2 = 1;
    }
    else {
      if (T2 <= uT){
        digitalWrite(REL2, HIGH);
        stat2 = 0;
      }
    }
  }
}