// ME 106
// Homework 5 - Auto Climate Control Simulation
// by Yasar Iqbal


// Add libraries
#include "DHT.h"                                // Temperature sensor library
#include <LiquidCrystal_I2C.h>                  // LCD library
#include <IRremote.h>                           // IR remote library

// Define integers
int TempCurrent = 0;                             // Set the current temperature initially to 0
int TempSet = 0;                                 // Set the set temperature initially to 0
int TempAdjust = 0;                              // Set the adjust temperature initially to 0

// IR remote button definitions
#define Button_1 0xFF40BF                       // IR remote + button
#define Button_2 0xFF19E6                       // IR remote - button
                                                // The following buttons used for troubleshooting
#define Button_3 0xFF0CF3                       // IR remote 1 button set to show TempCurrent
#define Button_4 0xFF18E7                       // IR remote 2 button set to show TempSet
#define Button_5 0xFF5EA1                       // IR remote 3 button set to show TempAdjust

//Temperature sensor stuff
#define DHTPIN 2                                // Temperature sensor input pin 
                                                // Comment out what type of sensors you are not using
// #define DHTTYPE DHT11                        // Temperature Sensor DHTTYPE DHT11
// #define DHTTYPE DHT21                        // Temperature Sensor DHTTYPE DHT21
#define DHTTYPE DHT22                           // Temperature Sensor DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);                       // Temperature sensor pin and type

// LCD stuff
LiquidCrystal_I2C lcd(0x27, 16, 2);             // LCD we are using

// IR remote stuff
int receiver = 5;                               //initialize pin 5 as recevier pin.
uint32_t Previous; 
IRrecv irrecv(receiver);                        //create a new instance of receiver
decode_results results;

// LED stuff
int RedLED = 8;                                 // Red led is board input 8
int BlueLED = 9;                                // Blue led is board input 9

// Millis stuff
const unsigned long eventInterval = 60000;      // Run millis function every 1 minute = 60 sec = 60,000 ms
unsigned long previousTime = 0;                 


void setup() {
 Serial.begin(9600);
 pinMode(8, OUTPUT);                            // Red led is an output
 pinMode(9, OUTPUT);                            // Blue led is an output
 dht.begin();                                   // initialize the temperature sensor
 lcd.backlight();                               // turn on lcd backlight
 lcd.init();                                    // initialize lcd
 irrecv.enableIRIn();                           //start the IR receiver
 TempCurrent = (int)dht.readTemperature(true);
}


// Function for millis (To check temperature sensor every 1 minute)
void millisfunction() {
  unsigned long currentTime = millis();         // Updates frequently
  // This event happens every 60,000 ms = 60 seconds = 1 minute
  if (currentTime - previousTime >= eventInterval) {
  // dht.readTemperature(true) shows temperature in drgrees F
  // dht.readTemperature(false) shows temperature in degrees C
   TempCurrent = (int)dht.readTemperature(true);// Update the current temperature
  // Update the timing for the next time around 
    previousTime = currentTime;
  }
}


// Function to update the LCD screen
void lcdfunction() {
lcd.clear();
   //TempCurrent = (int)dht.readTemperature(true);
   TempSet = TempCurrent + TempAdjust;
   lcd.setCursor(0,0);                          // Set the cursor on the first row and column
      lcd.print("Temp.    ");                   // Print the current temperature
      lcd.print(TempCurrent);                   
      lcd.print(" F");
      lcd.setCursor(0,1);                       // Set the cursor on the second row, first column
      lcd.print("Setpoint ");                   // Print the set point temperature 
     lcd.print(TempSet);                        
     lcd.print(" F");     
   delay(1000);                                 // Wait 1000 ms or 1 second for LCD refresh
   lcd.clear();
}
 

// Function to read the remote input  
void IRinputfunction() {
 if (irrecv.decode(&results)) {                 //if we have received an IR signal
  if (results.value==0xFFFFFFFF) { 
      results.value=Previous;
      }
    switch(results.value) {
      case Button_1 : TempAdjust = TempAdjust + 1;
      break;
      case Button_2 : TempAdjust = TempAdjust - 1;
      break;

      // Buttons set up to troubleshoot and find out what the temp values are
      case Button_3 : Serial.println (TempCurrent);  //digitalWrite(12, LOW);
      break;
      case Button_4 : Serial.println (TempSet);      //digitalWrite(12, LOW);
      break;
      case Button_5 : Serial.println (TempAdjust);;  //digitalWrite(12, LOW);
      break;          
      } 
 Serial.println (results.value, HEX);                //display HEX results 
 irrecv.resume();                                    //next value
 }
 Previous=results.value;
}


// Function to turn on correct led and fan
void ledfunction() {
   if (TempAdjust > 2)                               // If the adjustment is >2
    digitalWrite(8, HIGH);                           // Then turn on the red led
    else                                       
    digitalWrite(8, LOW);                            // Else, turn off the red led
    
   if (TempAdjust < -2)                              // If the adjustment is <-2
    digitalWrite(9, HIGH);                           // Then turn on the blue led
    else                                             
    digitalWrite(9, LOW);                            // Else, turn off the blue led
}


// The mail loop
void loop() {
 millisfunction();                                   // Call the millis function
 lcdfunction();                                      // Call the lcd function
 IRinputfunction();                                  // Call the IR input function
 ledfunction();                                      // Call the led function
}