// Christian Weber
// Stand: 25.08.2020


/********************************************************************/
// libraries BME280 Klimasensor
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>

#define SEALEVELPRESSURE_HPA (1013.25)

Adafruit_BME280 bme1;
Adafruit_BME280 bme2;

#include <Wire.h> 

// variables for target- and actual-value [°C]
float value[4];
int temp_soll = 30;     // target-value temperature
float temp_mean;        // mean temperature
float temp_tol = 0.5;   // Tolerance for temperature deviation from temp_set

float hum_mean;         // mean value Humidity
int hum_soll = 70;      // target value Humidity
float hum_tol = 2;      // tolerance Humidity

// Variable für Abfragerate (1*60 = 1 Minute)
const int SleeptimeS = 5;
 
// string for sensor namens
String addr[4];

// definition output relays peltier-element
int Relais_1A = 26;
int Relais_1B = 27;
int Relais_2A = 14;
int Relais_2B = 12;

// definition output relays fog generator
int Fog = 18;
int Fan = 19;

// definition fan (peltier-element)
int Fan_PE = 5;

uint timeStamp; 
int intervall;

/********************************************************************/

void setup(void)
{
  // start serial port & BME
  Serial.begin(9600);
  
  bme1.begin(0x76); 
  bme2.begin(0x77);

  /********************************************************************/


  // turn off relais for peltier element
  pinMode(Relais_1A, OUTPUT);
  pinMode(Relais_1B, OUTPUT);
  pinMode(Relais_2A, OUTPUT);
  pinMode(Relais_2B, OUTPUT);

  digitalWrite(Relais_1A, HIGH);
  digitalWrite(Relais_1B, HIGH);
  digitalWrite(Relais_2A, HIGH);
  digitalWrite(Relais_2B, HIGH);

  // output pins fog generator
  pinMode(Fog, OUTPUT);
  pinMode(Fan, OUTPUT);

  // output pin für fan-PE
  pinMode(Fan_PE, OUTPUT);

  // names of sensors
  addr[0] = "Humidity_H1";
  addr[1] = "Humidity_H2"; 
  addr[2] = "Temperature_T1";
  addr[3] = "Temperature_T2";

  Serial.println("SetUp done!");
}

void loop(void)
{
  /********************************************************************/
  //PE cooling on
  digitalWrite(Fan_PE, HIGH);

  //request sensor values
  value[0] = bme1.readTemperature();
  value[2] = bme1.readHumidity();
  value[1] = bme2.readTemperature();
  value[3] = bme2.readHumidity();

  Serial.print("Humidity 1: "); 
  Serial.print(value[3]); 
  Serial.println(" %");
  Serial.print("Temperauture 1: ");
  Serial.print(value[1]);
  Serial.println(" °C");  

   Serial.print("Humidity 2: "); 
  Serial.print(value[2]); 
  Serial.println(" %");
  Serial.print("Temperature 2: ");
  Serial.print(value[0]);
  Serial.println(" °C"); 
  
  /********************************************************************/
  // temperature controll

  // calculate mean temperature
  temp_mean = (value[0]+value[1])/2;
  Serial.println("mean temperature: " + String(temp_mean));

  // heat or cool
  if(temp_mean < temp_soll - temp_tol){ 
    Serial.println("Temperature to low!"); 
    digitalWrite(Relais_1A, HIGH); 
    digitalWrite(Relais_1B,HIGH);
    digitalWrite(Relais_2A, LOW);
    digitalWrite(Relais_2B, LOW);    
  }

  else if(temp_mean > temp_soll + temp_tol){
    Serial.println("Temperature to high!");
    digitalWrite(Relais_2A, HIGH);
    digitalWrite(Relais_2B, HIGH); 
    digitalWrite(Relais_1A, LOW);
    digitalWrite(Relais_1B, LOW);  
  }

  else{
  Serial.println("Temperatur passt!");
  digitalWrite(Relais_1A, HIGH);
  digitalWrite(Relais_1B, HIGH);
  digitalWrite(Relais_2A, HIGH);
  digitalWrite(Relais_2B, HIGH);
  }

  /********************************************************************/
  // Humidity controll
  // calculate mean humidity
  hum_mean = (value[2]+value[3])/2;

  if(hum_mean < hum_soll - hum_tol){ 
    Serial.println("humidity to low!");  
    digitalWrite(Fan, HIGH);
    digitalWrite(Fog, HIGH);    
  }

  else if(hum_mean > hum_soll + hum_tol){
    Serial.println("humidity to high!");
    digitalWrite(Fan, HIGH);
    digitalWrite(Fog, LOW);  
  }

  else{
    Serial.println("humidity is right!");
    digitalWrite(Fan, LOW);
    digitalWrite(Fog, LOW);
  }


  
}