#include "DHT.h" //--> DHT library
#include "SPI.h"
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"

#define TFT_DC 5
#define TFT_CS 16
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);
#define BLACK   0x0000
#define BLUE    0x001F
#define RED     0xF800
#define GREEN   0x07E0
#define CYAN    0x07FF
#define MAGENTA 0xF81F
#define YELLOW  0xFFE0
#define WHITE   0xFFFF
#define ORANGE  0xFD20
#define DARKORANGE  0xFB60
#define MAROON  0x7800
#define DHTPIN 33
#define DHTTYPE DHT11   
DHT dht11(DHTPIN, DHTTYPE);

int h;
float t;
float f;
float hif;
float hic;
//----------------------------------------The x and y points for the Temperature bar
int x_bar_t = 20;
int y_bar_t = 60;
//----------------------------------------The variable to hold the conversion value from the temperature value to the value for the temperature bar
int T_to_Bar;
//----------------------------------------Millis variable to update the temperature and humidity values
unsigned long previousMillis = 0; //--> will store last time updated
// constants won't change:
const long interval = 2000; //--> interval 

void setup() {
  Serial.begin(115200);
  tft.begin(); //--> SPFD5408/ILI9341
  tft.setRotation(135); //--> Need for the Mega, please changed for your choice or rotation initial
  tft.fillScreen(WHITE); //--> TFT LCD background color
  dht11.begin();
  //----------------------------------------Initial view  
  tft.drawLine(15, 40, 300, 40, MAROON); //--> tft.drawLine(x, y, x size, y size, MAROON)
  tft.drawLine(15, 39, 300, 39, MAROON);

  tft.setTextSize(2);
  tft.setTextColor(BLUE);
  tft.setCursor(60,20); //--> tft.setCursor(x, y)
  tft.print("Temperature");
  
  //draw_bar(x_bar_t, y_bar_t);

  tft.drawLine(190, 60, 190, 227, MAROON);
  tft.drawLine(190, 127, 300, 127, MAROON);

  tft.fillRect(202, 60, 100, 27, CYAN);
  tft.setTextSize(2);
  tft.setTextColor(WHITE);
  tft.setCursor(205, 65);
  tft.print("Humidity");

  tft.fillRect(202, 140, 100, 43, GREEN);
  tft.setTextSize(2);
  tft.setTextColor(WHITE);
  tft.setCursor(220, 145);
  tft.print("MIN");
  tft.setCursor(220, 165);
  tft.print("MAX");

  //DHT11Data();
  delay(1000);
  }
void loop() {
  // put your main code here, to run repeatedly:

  //----------------------------------------Millis to update the temperature and humidity values
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    // save the last time you blinked the LED
    previousMillis = currentMillis;
    
    //GetDHT11Data();
  }
  //----------------------------------------Temperature bar
  T_to_Bar = map(t, 0.0, 50.0, 108, 0);

  tft.fillRect(x_bar_t+8, (y_bar_t+8)+T_to_Bar, 19, 108-T_to_Bar, ORANGE);
  tft.fillRect(x_bar_t+8, y_bar_t+8, 19, T_to_Bar, WHITE);
  //----------------------------------------

  tft.setTextSize(2);
  tft.setTextColor(ORANGE, WHITE);
  tft.setCursor(75, 100);
  tft.print(t);
  if (t < 10) tft.print(" ");
  tft.setCursor(160, 100);
  tft.print((char)247);
  tft.println("C");

  
  tft.setCursor(75, 135);
  tft.print(f);
  if (f < 100) tft.print(" ");
  tft.setCursor(160, 135);
  tft.print((char)247);
  tft.println("F");

  tft.setTextSize(3);
  tft.setTextColor(CYAN, WHITE);
  tft.setCursor(205, 95);
  tft.print(h);
  tft.print(" %");

  tft.setTextSize(1);
  tft.setTextColor(GREEN, WHITE);
  tft.setCursor(205, 200);
  tft.print(hic);
  tft.print(" ");
  tft.print((char)247);
  tft.print("C");
  if (hic < 10) tft.print(" ");

  tft.setTextSize(1);
  tft.setTextColor(GREEN, WHITE);
  tft.setCursor(205, 220);
  tft.print(hif);
  tft.print(" ");
  tft.print((char)247);
  tft.print("F");
  if (hif < 100) tft.print(" "); 

 //========================================================================GetDHT11Data()
 
  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  h = dht11.readHumidity();
  // Read temperature as Celsius (the default)
  t = dht11.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  f = dht11.readTemperature(true);

  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f)) {
    
    return;
  }

  // Compute heat index in Fahrenheit (the default)
  hif = dht11.computeHeatIndex(f, h);
  // Compute heat index in Celsius (isFahreheit = false)
  hic = dht11.computeHeatIndex(t, h, false);
//========================================================================

//========================================================================draw_bar(x, y)
int x_bar;
 int y_bar ;
  tft.fillRoundRect(x_bar,y_bar, 35, 120, 5, BLACK);
  tft.fillCircle(x_bar+17, y_bar+140, 30, BLACK);
  tft.fillRoundRect(x_bar+4, y_bar+4, 27, 120, 2, WHITE);
  tft.fillCircle(x_bar+17, y_bar+140, 25, WHITE);
  tft.fillRect(x_bar+8, y_bar+8, 19, 120, DARKORANGE);
  tft.fillCircle(x_bar+17, y_bar+140, 21, DARKORANGE);

  //tft.fillRect(41, 58, 19, 108, RED);

  tft.drawLine(x_bar+37, y_bar+8, x_bar+42, y_bar+8, RED);
  tft.setTextSize(1);
  tft.setTextColor(RED);
  tft.setCursor(x_bar+47, y_bar+4);
  tft.println("50");
  
  tft.drawLine(x_bar+37, y_bar+115, x_bar+42, y_bar+115, RED);
  tft.setCursor(x_bar+47, y_bar+111);
  tft.println("0");
}