/* Arduino example code for DHT11, DHT22/AM2302 
  and DHT21/AM2301 temperature and humidity sensors 
  with I2C LCD. More info: www.www.makerguides.com */

#include "Adafruit_Sensor.h"
#include "DHT.h"
#include "Wire.h"
#include "LiquidCrystal_I2C.h"

// Set DHT pin:
#define DHTPIN 2

// Define SDA and SCL pin for LCD:
#define SDAPin A4 // Data pin
#define SCLPin A5 // Clock pin

// Set DHT type, uncomment whatever type you're using!
//#define DHTTYPE DHT11   // DHT 11 
#define DHTTYPE DHT22   // DHT 22  (AM2302)
//#define DHTTYPE DHT21   // DHT 21 (AM2301)

// Initialize DHT sensor for normal 16mhz Arduino:
DHT dht = DHT(DHTPIN, DHTTYPE);

// Connect to LCD via I2C, default address 0x27 (A0-A2 not jumpered):
LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 20, 4); //Change to (0x27,20,4) for 2004 LCD

//Declaration for Humidity & Heat
float SetTem = 38.0;//Default Set Temperature
float AlarmTemp=39.0;//Default High Temperature Value
float AlarmHumi=60.0;//Default High Humidity Value
float h = 0.00;//Declaration for Humidity
float t = 0.00;//Declaration for Temperature in Degree Celcius(Default)
float f = 0.00;//Declaration for Temperature in Fahrenheit
float hif = 0.00; // Declaration for  heat index in Fahrenheit (default)
float hic = 0.00; // Declaration for heat index in Celsius
String Alarm="Working";//Declaration for Alarm when Temperature or Humidity is high or low
//Set Main Temperature
const float BETA = 3950; // should match the Beta Coefficient of the thermistor
int analogValue = analogRead(A0);

//=============For Button Declaration==============================
int menuBut=13;//pin for Menu Button
int plusBut=11;//pin for Plus Button
int minusBut=12;//pin for Minus Button
int but_State=0;//Button State value
int mem_menu=0;//value for menu button memory
int mem_plus=0;//value for plus button memory
int mem_minus=0;//value for minus button memory
int pageNumb=1;//value for pageNumb
int pageLimit=3;//value for page number
int OnDelay=10000;
int Count=1;//variable for number of times used


//Relays Declaration
int R1=4;  //Heater relay assign to pin 4
int R2=5;  //Extraction fan relay assign to pin 5(High humidity & High temperature)
//Set button description----------------------------



void setup() {
  // Setup sensor:
  dht.begin();

  pinMode(R1, OUTPUT);
  pinMode(R2, OUTPUT);
  pinMode(menuBut, INPUT);
  pinMode(plusBut, INPUT);
  pinMode(minusBut, INPUT);

  // Initiate the LCD:
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 2);
  lcd.print(mem_menu);

  digitalWrite(R1, LOW);//Set heater to Off
  digitalWrite(R2, LOW);//Set Extractor to off
  delay(500);
}

void loop() {
  // Wait a few seconds between measurements:
  //delay(500);

ReadMainTemp();
Button_Push();

  if (pageNumb==1) {Page1();}
  if (pageNumb==2) {Page2();}

  //Turn On/Off Heater
if (t<SetTem) {
lcd.setCursor(0, 2);
Alarm="Heater On          ";
digitalWrite(R1, HIGH);
}else {
 //lcd.setCursor(0, 2);
//lcd.print("Heater Off");
digitalWrite(R1, LOW); 
}

 //Turn On or Off Extractor for High or Low Temperature
if (t>=AlarmTemp) {
lcd.setCursor(0, 2);
Alarm="Temp High  ";
digitalWrite(R2, HIGH);
loop();//bypass checking if humidity is high or low
}else {
 //lcd.setCursor(0, 2);
//lcd.print("Extractor Off");
digitalWrite(R2, LOW); 
}

 //Turn On or Off Extractor for High or Low Humidity
if (h>=AlarmHumi) {
lcd.setCursor(0, 2);
Alarm="Humid High     ";
digitalWrite(R2, HIGH);
}else {
 //lcd.setCursor(0, 2);
//lcd.print("Extractor Off");
digitalWrite(R2, LOW); 
}

  }

  void Button_Push(){
   //read menu button
 but_State=digitalRead(menuBut);//Button State for when any button is pressed
 if((but_State != mem_menu) && (but_State==HIGH)){pageNumb++;lcd.clear();}
 if(pageNumb >= pageLimit){pageNumb = 1;}
 mem_menu=but_State;//give menu button memory the value of button state

//read plus button
//but_State=digitalRead(plusBut);//Button State for when any button is pressed
//if((but_State != mem_plus) && (but_State==HIGH) && (pageNumb==1)){lcd.clear();}
//mem_plus=but_State;//give menu button memory the value of button state

//read Minus button
//but_State=digitalRead(minusBut);//Button State for when any button is pressed
//if((but_State != mem_minus) && (but_State==HIGH) && (pageNumb==1)){lcd.clear();}
//mem_minus=but_State;//give menu button memory the value of button state
}

void ReadMainTemp()//Read Main Temperature
{
    // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)

  // Read the humidity in %:
h = dht.readHumidity();
  // Read the temperature as Celsius:
t = dht.readTemperature();
  // Read the temperature as Fahrenheit:
 f = dht.readTemperature(true);

  // Compute heat index in Fahrenheit (default):
hif = dht.computeHeatIndex(f, h);
  // Compute heat index in Celsius:
hic = dht.computeHeatIndex(t, h, false);
}

void Page1()
{
  // Print the temperature and the humidity on the LCD:
  
  lcd.setCursor(0, 0);//(column_index, row_index)
  lcd.print("MainTemp: ");
  lcd.print(t);
  lcd.print(" " "\xDF" "C      ");
  lcd.setCursor(0, 1);//(column_index, row_index)
  lcd.print("Humid: ");
  lcd.print(h);
  lcd.print(" %");
  lcd.setCursor(0, 3);//(column_index, row_index)
  lcd.print(Alarm);
}

void Page2()
{
  lcd.setCursor(0, 0);//(column_index, row_index)
  lcd.print("Set High Temp CutOff");
  lcd.setCursor(0, 1);//(column_index, row_index)
  lcd.print(pageNumb);
   lcd.setCursor(0, 2);//(column_index, row_index)
  lcd.print(menuBut);
   lcd.setCursor(0, 3);//(column_index, row_index)
  lcd.print(but_State);
}

void ReadTemperature()
{
  float celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
}