#include <Wire.h> // Library for I2C communication
#include <LiquidCrystal_I2C.h> // Library for LCD
#include <Adafruit_ILI9341.h>

// Wiring: SDA pin is connected to A4 and SCL pin to A5.
// Connect to LCD via I2C, default address 0x27 (A0-A2 not jumpered)
LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 16, 2); // Change to (0x27,20,4) for 20x4 LCD.

int pitprobe1;
int meatprobe1;
int probestate1;// On/Off states of the meat probes.
int probestate2;// On/Off states of the meat probes.
int BBQFAN; 

/* Temperature Threshold */
int targetTempBBQPROBE = 100;
int targetTempMEATPROBE1 = 100;

int buttonpin1 = 0;     // the number of the pushbutton pin
int buttonpin2 = 1;     // the number of the pushbutton pin
int buttonpin3 = 2;     // the number of the pushbutton pin

int buttonone = 0;  // A filtered conditioned button state used for direct control.
int buttontwo = 0;
int buttonthree = 0;

int onestatelast = 1;
int twostatelast = 1;
int threestatelast = 1;

int dt=100;

int screen = 1;
int WhichScreen = 1;
boolean hasChanged = true;

/* Steinhart-Hart coefficients*/
#define COEFFICIENTA        -0.000099646
#define COEFFICIENTB        0.000352239
#define COEFFICIENTC        -0.000000257

#define NUMSAMPLES 3    // The number of samples in a row to take

/* Volatge Divider values */
#define SERIESRESISTOR 10000

float celsius;
int samples[NUMSAMPLES];
int THERMISTORPIN;

/* Pins */
int PitProbePin = A0;
int MeatProbe1Pin = A1;

//TFT
#define TFT_CS   9
#define TFT_DC   10
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);

#define WIDTH 320
#define HEIGHT 240

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(buttonpin1, INPUT_PULLUP);
pinMode(buttonpin2, INPUT_PULLUP);
pinMode(buttonpin3, INPUT_PULLUP);

tft.begin();
tft.setRotation(1);
tft.setCursor(26, 120);
tft.setTextColor(ILI9341_RED);
tft.setTextSize(5);
tft.println("Hello, TFT!");

tft.setCursor(20, 160);
tft.setTextColor(ILI9341_GREEN);
tft.setTextSize(5);
tft.println("I can has colors?");
// Initiate the LCD:
  lcd.init();
  lcd.backlight();
  lcd.home();
  lcd.setCursor(0,0);
  String message = "BBQ VENTILATOR";
  for (byte i = 0; i < message.length(); i++) {
    lcd.print(message[i]);
    delay(100);
  }
  lcd.setCursor(0, 1);
  String message1 = "AND TEMP PROBE";
  for (byte i = 0; i < message1.length(); i++) {
    lcd.print(message1[i]);
    delay(100);
  }
  delay(1000);
  lcd.clear();
  screen = 0;
}

void loop() {

int onestate=digitalRead(buttonpin1);
if(onestatelast==0 && onestate==1){
  if (buttonone==0){
    hasChanged = true;
    WhichScreen++;
    if (WhichScreen > 6) {
      WhichScreen = 1;
    }
  }
}
onestatelast=onestate;

if (hasChanged == true) {
  hasChanged = false;
    switch (WhichScreen) {
          case 1:
            screen = 1;
            lcd.clear();
            break;

          case 2:
            screen = 2;
            lcd.clear();
            break;

          case 3:
            screen = 3;
            lcd.clear();
            break;
          
          case 4:
            screen = 4;
            lcd.clear();
            break;

          case 5:
            screen = 5;
            lcd.clear();
            break;

          case 6:
            screen = 6;
            lcd.clear();
            break;

          case 0:
            break;
        }
}

/*
int twostate=digitalRead(buttonpin2);
if(twostatelast==0 && twostate==1){
  if (buttontwo==0){
    buttontwo=1;
    delay(dt);
  }else{
    buttontwo=0;
    delay(dt);
  }
}
twostatelast=twostate;

int threestate=digitalRead(buttonpin3);
if(threestatelast==0 && threestate==1){
  if (buttonthree==0){
    buttonthree=1;
    delay(dt);
  }else{
    buttonthree=0;
    delay(dt);
  }
}
threestatelast=threestate;
*/

int twostate=digitalRead(buttonpin2);
  if(twostate != twostatelast){
    if (twostate== LOW){
      if (screen == 2){
        probestate1 = 1;
      }
      if (screen == 3){
        probestate2 = 1;
      }
      if (screen == 4){
        BBQFAN = 1;
      }
      if (screen == 5){
        targetTempBBQPROBE = targetTempBBQPROBE + 10;
        delay(dt);
      }
       if (screen == 6){
        targetTempMEATPROBE1 = targetTempMEATPROBE1 + 10;
        delay(dt);
      }
    }
    delay(dt);
  }
twostatelast=twostate;

int threestate=digitalRead(buttonpin3);
  if(threestate != threestatelast){
    if (threestate== LOW){
      if (screen == 2){
        probestate1 = 0;
      }
      if (screen == 3){
        probestate2 = 0;
      }
      if (screen == 4){
        BBQFAN = 0;
      }
      if (screen == 5){
        targetTempBBQPROBE = targetTempBBQPROBE - 10;
        delay(dt);
      }
      if (screen == 6){
        targetTempMEATPROBE1 = targetTempMEATPROBE1 - 10;
        delay(dt);
      }
    }
    delay(dt);
  }
threestatelast=threestate;

if (screen == 1){
    if (probestate1 == 1){//BBQ PROBE 1
      int pitprobe1 = tempRead(PitProbePin);
      lcd.setCursor(0,0);
      lcd.print("BBQ PROBE:");
      lcd.setCursor(13,0);
      lcd.print(pitprobe1 );
    } else {
      lcd.setCursor(0,0);
      lcd.print("BBQ PROBE:");
      lcd.setCursor(13,0);
      lcd.print(pitprobe1 );
      int pitprobe1 = 0;
    }
    
    if (probestate2 == 1){//MEAT PROBE 1
      int meatprobe1 = tempRead(MeatProbe1Pin);
      lcd.setCursor(0,1);
      lcd.print("MEAT PROBE:");
      lcd.setCursor(13,1);
      lcd.print(meatprobe1 );
    } else {
      lcd.setCursor(0,1);
      lcd.print("MEAT PROBE:");
      lcd.setCursor(13,1);
      lcd.print(meatprobe1 );
      int meatprobe1 = 0;
    }
 }

if (screen == 2){
  LCDTEMPDisplay2 ();
}
if (screen == 3){
  LCDTEMPDisplay3 ();
}
if (screen == 4){
  LCDTEMPDisplay4 ();
}
if (screen == 5){
  LCDTEMPDisplay5 ();
}
if (screen == 6){
  LCDTEMPDisplay6 ();
}
}

void LCDTEMPDisplay2 (){
  if (probestate1 == 1){
    lcd.setCursor(0,0);
    lcd.print("BBQ PROBE:");
    lcd.setCursor(13,0);
    lcd.print(" ON");
  }else{
    lcd.setCursor(0,0);
    lcd.print("BBQ PROBE:");
    lcd.setCursor(13,0);
    lcd.print("OFF");
  }
}

void LCDTEMPDisplay3(){
  if (probestate2 == 1){
    lcd.setCursor(0,0);
    lcd.print("MEAT PROBE:");
    lcd.setCursor(13,0);
    lcd.print(" ON");
  }else{
    lcd.setCursor(0,0);
    lcd.print("MEAT PROBE:");
    lcd.setCursor(13,0);
    lcd.print("OFF");
  }
}

void LCDTEMPDisplay4(){
  if (BBQFAN == 1){
    lcd.setCursor(0,0);
    lcd.print("BBQ FAN:");
    lcd.setCursor(13,0);
    lcd.print(" ON");
  }else{
    lcd.setCursor(0,0);
    lcd.print("BBQ FAN:");
    lcd.setCursor(13,0);
    lcd.print("OFF");
  }
  /*
  if (pitprobe1 == targetTempBBQPROBE) { // BLOWER OFF
    lcd.setCursor(0,1);
    lcd.print("BLOWER OFF");
  } else if (pitprobe1 >= targetTempBBQPROBE - 10) { // BLOWER OFF
    lcd.setCursor(0,1);
    lcd.print("BLOWER OFF");
  } else if (pitprobe1 >= targetTempBBQPROBE - 35) { // BLOWER ON AT HALF SPEED
    lcd.setCursor(0,1);
    lcd.print("BLOWER ON: AT HALF SPEED");    
  } else if (pitprobe1 <= targetTempBBQPROBE - 35){// BLOWER ON AT FULL SPEED
    lcd.setCursor(0,1);
    lcd.print("BLOWER ON: AT FULL SPEED");
  }*/
}

void LCDTEMPDisplay5(){
    lcd.setCursor(0,0);
    lcd.print("SET TARGET ");
    lcd.setCursor(0,1);
    lcd.print("BBQ PROBE:");
    lcd.setCursor(13,1);
    lcd.print(targetTempBBQPROBE);
    lcd.print(" C  ");
}

void LCDTEMPDisplay6(){
    lcd.setCursor(0,0);
    lcd.print("SET TARGET");
    lcd.setCursor(0,1);
    lcd.print("MEAT PROBE:");
    lcd.setCursor(13,1);
    lcd.print(targetTempMEATPROBE1);
    lcd.print(" C  ");
}

/****** Calculate Temperature ******/
int tempRead(int THERMISTORPIN){

 uint8_t i;
  float Resistance;

  // take N samples in a row, with a slight delay
  for (i=0; i< NUMSAMPLES; i++) {
   samples[i] = analogRead(THERMISTORPIN);
   delay(10);
  }
  
  // average all the samples out
  Resistance = 0;
    for (i=0; i< NUMSAMPLES; i++) {
     Resistance += samples[i];
  }
  Resistance /= NUMSAMPLES;

  // convert the value to resistance
  Resistance = 1023 / Resistance - 1;
  Resistance = SERIESRESISTOR / Resistance;

float steinhart;
// Temperature in Kelvin = 1 / {A + B[ln(R)] + C[ln(R)]^3} Steinhart–Hart equation
steinhart = log(Resistance);
 
steinhart = 1 / (COEFFICIENTA + (COEFFICIENTB * steinhart) + (COEFFICIENTC * steinhart * steinhart * steinhart));
celsius = steinhart - 273.15; // convert to C
return celsius;
}