/* Created by Ralph Nader on 1/10/19.
   Copyright  2019 Ralph Nader. All rights reserved.
   Made with  for everyone.
   Spread your knowledge.
   If you have any error or question, email me at "ralph@driple.co".
*/
#include <LiquidCrystal.h>             // Include the LiquidCrystal library.
#include "DHT.h"                       // Include the DHT library.

#define DHTPIN 8                       // Set the DHT Pin.
#define DHTTYPE DHT11                  // Set the DHT type.

LiquidCrystal lcd(1, 2, 4, 5, 6, 7);   // Creates a LiquidCrystal object. Parameters: (RS, Enable (E), d4, d5, d6, d7).
DHT dht(DHTPIN, DHTTYPE);              // Creates a DHT object. Parameters: (DHT Pin, DHT Type).

const int blueLED = 9;                  // Adds a led light (in that case, it is blue) to pin 9.
const int greenLED = 10;                // Adds a led light (in that case, it is green) to pin 10.
const int redLED = 11;                  // Adds a led light (in that case, it is red) to pin 11.

void setup() {
  //lcd.begin(16, 2);                    // Initializes the interface to the LCD screen, and specifies the dimensions (width and height) of the display.
  //lcd.setCursor(0, 0);                 // Set the cursor to column 0, line 0.
  Serial.begin(9600);
  Serial.println(F("DHT LED Test!"));
  
  pinMode(blueLED, OUTPUT);            // Change to output the blue pin.
  pinMode(greenLED, OUTPUT);           // Change to output the grene pin.
  pinMode(redLED, OUTPUT);             // Change to output the red pin.

  dht.begin();                         // Launch the DHT11 sensor.
  digitalWrite(blueLED,LOW);           // Turn off blue LED.
  digitalWrite(greenLED,LOW);          // Turn off green LED.
  digitalWrite(redLED, LOW);           // Turn off red LED.

  //lcd.print("Temperature:");           // Print "Temperature:" on LCD Screen.
  //lcd.setCursor(0, 1);                 // Set the cursor to column 0, line 1.
  //lcd.print("Humidity   :");           // Print "Humidity:" on LCD Screen.
  
}

void loop() {
  delay(1000);                         // Wait 0.5 seconds before updating the values.
  float T = dht.readTemperature();    // Read temperature in Celsius. If you want the Temperature in Fahrenheit, simply add "true" between the parentheses ==> float T = dht.readTemperature(True);
  float H = dht.readHumidity();       // Read humidity in percentage.

  if (isnan(H) && isnan(T)) {         // See if H (the Humidity variable) is NaN (Not A Number) && (Logical AND) See if T (the Temperature variable) is NaN to show error. 
    lcd.print("ERROR");               // Print error where there's the error.
    return;                           // Repeat the process with each update (each second).
  }

  if(T>22){                           // See if the temperature is higher than 22C.
    digitalWrite(redLED, HIGH);       // The red led will turn on.
    digitalWrite(blueLED, LOW);       // The blue led will turn off.
    digitalWrite(greenLED, LOW);      // The green led will turn off.
    
  }
  else if(T<22){                      // If the temperature is less than 22C.
    digitalWrite(blueLED, HIGH);      // The blue led will turn on.
    digitalWrite(greenLED, LOW);      // The green led will turn off.
    digitalWrite(redLED, LOW);        // The red led will turn off.
  }

  else if(T=22){                      // If the temperature is equal to 22C.
    digitalWrite(greenLED, HIGH);     // The green led will turn on.
    digitalWrite(redLED, LOW);        // The red led will turn off.
    digitalWrite(blueLED, LOW);       // The blue led will turn off.
  }

  //lcd.setCursor(1, 0);               // Set the cursor to column 12, line 0.
  //lcd.print(T);                       // Print the temperature.
  //lcd.setCursor(1, 1);               // Set the cursor to column 12, line 1.
  //lcd.print(H);                       // Print the humidity level.

  Serial.print(F("Humidity: "));
  Serial.print(H);
  Serial.print(F("%   Temperature:"));
  Serial.print(T);
  Serial.println(F("°C"));
}