/*
 * Created by ArduinoGetStarted.com
 *
 * This example code is in the public domain
 *
 * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-temperature-humidity-sensor
 */

#include "DHT.h"

#define RELAY_PIN_1 6 // Arduino pin connected to relay for hydrator
#define RELAY_PIN_2 7 // Arduino pin connected to relay for dehumidifier 
#define RELAY_PIN_3 8 // Arduino pin connected to relay for dehumidifier fan
#define RELAY_PIN_4 9 // Arduino pin connected to relay for Heater
#define DHTPIN1 2  // Arduino pin connected to DHT22 first sensor
#define DHTPIN2 3  // Arduino pin connected to DHT22 second sensor
#define DHTTYPE1 DHT22 // DHT 22 (AM2302)
#define DHTTYPE2 DHT22 // DHT 22 (AM2302)

DHT dht1(DHTPIN1, DHTTYPE1);
DHT dht2(DHTPIN2, DHTTYPE1);

const int TEMP_THRESHOLD_IN = 25; // upper threshold of indoors temperature, change to your desire value
const int HUM_THRESHOLD_IN = 70; // lower threshold of indoors humidity, change to your desire value
const int TEMP_THRESHOLD_OUT = 20; // upper threshold of outdoor temperature, change to your desire value
const int HUM_THRESHOLD_OUT = 70; // upper threshold of outdoor humidity, change to your desire value

int chk;
float temp1;
float temp2;
float hum1;
float hum2;

void setup() {
  Serial.begin(9600); // initialize serial
  dht1.begin();        // initialize the sensor 1
  dht2.begin();        // initialize the sensor 2
  pinMode(RELAY_PIN_1, OUTPUT); // initialize digital pin as an output
  pinMode(RELAY_PIN_2, OUTPUT); // initialize digital pin as an output
  pinMode(RELAY_PIN_3, OUTPUT); // initialize digital pin as an output
  pinMode(RELAY_PIN_4, OUTPUT); // initialize digital pin as an output
}

void loop() {
  // wait a few seconds between measurements.
  delay(2000);

  temp1 = dht1.readTemperature();;  // read temperature in Celsius from sensor 1
  temp2 = dht2.readTemperature();;  // read temperature in Celsius from sensor 2
  hum1 = dht1.readHumidity();;  // read relative humidity from sensor 1
  hum2 = dht2.readHumidity();;  // read relative humidity from sensor 2
  
  if (isnan(temp1)) {
    Serial.println("Failed to read from DHT sensor!");
  }
  if (isnan(temp2)) {
    Serial.println("Failed to read from DHT sensor!");
  }
  if (isnan(hum1)) {
    Serial.println("Failed to read from DHT sensor!");
  }
  if (isnan(hum2)) {
    Serial.println("Failed to read from DHT sensor!");
  } else {
    if((temp2 > TEMP_THRESHOLD_OUT) && (hum2 > HUM_THRESHOLD_OUT) ){
    if((temp1 > TEMP_THRESHOLD_IN)){
      Serial.println("Cooling");
      digitalWrite(RELAY_PIN_1, LOW); // turn off humidifier
      digitalWrite(RELAY_PIN_3, HIGH); // turn on cooler
      digitalWrite(RELAY_PIN_4, LOW); // turn off heater
    }  if((temp1 < (TEMP_THRESHOLD_IN -5))){
      Serial.println("Optimal C");
      digitalWrite(RELAY_PIN_1, LOW); // turn off humidifier
      digitalWrite(RELAY_PIN_3, LOW); // turn off cooler
      digitalWrite(RELAY_PIN_4, LOW); // turn off heater
    } if((hum1 > HUM_THRESHOLD_IN)){
      Serial.println("Dehumidify");
      digitalWrite(RELAY_PIN_1, LOW); // turn off humidifier
      digitalWrite(RELAY_PIN_2, HIGH); // turn on dehumidifier
      digitalWrite(RELAY_PIN_4, LOW); // turn off heater
    } if((hum1 < (HUM_THRESHOLD_IN - 10))){
      Serial.println("Optimal HUM");
      digitalWrite(RELAY_PIN_1, LOW); // turn off humidifier
      digitalWrite(RELAY_PIN_2, LOW); // turn off dehumidifier
      digitalWrite(RELAY_PIN_4, LOW); // turn off heater
    }
    }
    if((temp2 > TEMP_THRESHOLD_OUT) && (hum2 < HUM_THRESHOLD_OUT) ){
    if((temp1 > TEMP_THRESHOLD_IN)){
      Serial.println("Cooling");
      digitalWrite(RELAY_PIN_2, LOW); // turn off dehumidifier 
      digitalWrite(RELAY_PIN_3, HIGH); // turn on cooler
      digitalWrite(RELAY_PIN_4, LOW); // turn off heater
    }  if((temp1 < (TEMP_THRESHOLD_IN -5))){
      Serial.println("Optimal C");
      digitalWrite(RELAY_PIN_2, LOW); // turn off dehumidifier 
      digitalWrite(RELAY_PIN_3, LOW); // turn off cooler
      digitalWrite(RELAY_PIN_4, LOW); // turn off heater
    } if((hum1 > HUM_THRESHOLD_IN)){
      Serial.println("Optimal HUM");
      digitalWrite(RELAY_PIN_1, LOW); // turn off humidifier
      digitalWrite(RELAY_PIN_2, LOW); // turn off dehumidifier
      digitalWrite(RELAY_PIN_4, LOW); // turn off heater
    } if((hum1 < (HUM_THRESHOLD_IN - 10))){
      Serial.println("Humidify");
      digitalWrite(RELAY_PIN_1, HIGH); // turn on humidifier
      digitalWrite(RELAY_PIN_2, LOW); // turn off dehumidifier
      digitalWrite(RELAY_PIN_4, LOW); // turn off heater
    }
    }
    if((temp2 < TEMP_THRESHOLD_OUT) && (hum2 > HUM_THRESHOLD_OUT) ){
    if((temp1 > TEMP_THRESHOLD_IN)){
      Serial.println("Optimal C");
      digitalWrite(RELAY_PIN_1, LOW); // turn off humidifier
      digitalWrite(RELAY_PIN_3, LOW); // turn of cooler
      digitalWrite(RELAY_PIN_4, LOW); // turn off heater
    }  if((temp1 < (TEMP_THRESHOLD_IN -5))){
      Serial.println("Heating");
      digitalWrite(RELAY_PIN_1, LOW); // turn off humidifier
      digitalWrite(RELAY_PIN_3, LOW); // turn off cooler
      digitalWrite(RELAY_PIN_4, HIGH); // turn on heater
    } if((hum1 > HUM_THRESHOLD_IN)){
      Serial.println("Dehumidify");
      digitalWrite(RELAY_PIN_1, LOW); // turn off humidifier
      digitalWrite(RELAY_PIN_2, HIGH); // turn on dehumidifier
      digitalWrite(RELAY_PIN_3, LOW); // turn off cooler
    } if((hum1 < (HUM_THRESHOLD_IN - 10))){
      Serial.println("Optimal HUM");
      digitalWrite(RELAY_PIN_1, LOW); // turn off humidifier
      digitalWrite(RELAY_PIN_2, LOW); // turn off dehumidifier
      digitalWrite(RELAY_PIN_3, LOW); // turn off cooler
    }
    }
    if((temp2 < TEMP_THRESHOLD_OUT) && (hum2 < HUM_THRESHOLD_OUT) ){
    if((temp1 > TEMP_THRESHOLD_IN)){
      Serial.println("Optimal C");
      digitalWrite(RELAY_PIN_2, LOW); // turn off dehumidifier 
      digitalWrite(RELAY_PIN_3, LOW); // turn off cooler
      digitalWrite(RELAY_PIN_4, LOW); // turn off heater
    }  if((temp1 < (TEMP_THRESHOLD_IN -5))){
      Serial.println("Heating");
      digitalWrite(RELAY_PIN_2, LOW); // turn off dehumidifier 
      digitalWrite(RELAY_PIN_3, LOW); // turn off cooler
      digitalWrite(RELAY_PIN_4, HIGH); // turn on heater
    } if((hum1 > HUM_THRESHOLD_IN)){
      Serial.println("Optimal HUM");
      digitalWrite(RELAY_PIN_1, LOW); // turn off humidifier
      digitalWrite(RELAY_PIN_2, LOW); // turn off dehumidifier
      digitalWrite(RELAY_PIN_3, LOW); // turn off cooler
    } if((hum1 < (HUM_THRESHOLD_IN - 10))){
      Serial.println("Humidify");
      digitalWrite(RELAY_PIN_1, HIGH); // turn on humidifier
      digitalWrite(RELAY_PIN_2, LOW); // turn off dehumidifier
      digitalWrite(RELAY_PIN_3, LOW); // turn off cooler
    }
    }
  }
}