#include <LiquidCrystal_I2C.h>
#include "DHT.h"

int potpin = 0;  // analog pin used to connect the potentiometer
int val;    // variable to read the value from the analog pin
LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x27 for a 16 chars and 2 line display

#define DHTPIN 2     // Digital pin connected to the DHT sensor



#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321





DHT dht(DHTPIN, DHTTYPE);

#define LED_RED 13   // defining where the led is connected
#define LED_BLUE 11

void setup()
{
   
  Serial.begin(9600);
  lcd.init();                      // initialize the lcd
  // Print a message to the LCD.
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Exercise 2");
  delay(1000);

  lcd.clear();
  delay(1000);

  lcd.setCursor(0,0);
  lcd.print("Ideal temp: " + String(val));
  delay(1000);
  lcd.clear();

  lcd.setCursor(0,0);
  lcd.print("Humidity: " + String(val));
  delay(1000);
  lcd.clear();

  val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023)
  val = map(val, 0, 1023, 0, 80); 
  Serial.print("Ideal temp: " + String(val));
  lcd.setCursor(0,0);
  lcd.print("Ideal temp:" + String(val));
  delay(1000);

  Serial.print("Humidity: " + String(val));
  lcd.setCursor(0,0);
  lcd.print("Humidity:" + String(val));
  delay(1000);
  dht.begin();

  pinMode(LED_RED, OUTPUT);  // check 
  pinMode(LED_BLUE, OUTPUT); // check

}


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

  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  float f = dht.readTemperature(true);

  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }


 
  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%Ideal Temperature: "));
  Serial.print(t);
  Serial.print(F("°C "));
  Serial.print(f);

  lcd.setCursor(0,0);
  lcd.println("Temp: " + String(t));
  delay(5000);

  if(t > val) {
    Serial.println("The Heater is switched off");
    digitalWrite(LED_RED, LOW);
  }
  if(t < val) {
    Serial.println("The DC Heater is switched on");
    digitalWrite(LED_BLUE, LOW);
  }
  if(t > 2 + val) {
    Serial.println("The DC motor is switched off");
    digitalWrite(LED_BLUE, HIGH);}
    
    
  }