#include <Adafruit_GFX.h> 
#include <SPI.h>       
#include <Adafruit_ILI9341.h>  
#include <DHT.h>
#define LCD_CS 10
#define LCD_CD 9

Adafruit_ILI9341 tft = Adafruit_ILI9341(LCD_CS, LCD_CD);

#define BLACK       0x0000
#define BLUE        0x001F
#define LIGHT_BLUE  0x0575
#define RED         0xF800
#define GREEN       0x07E0
#define GREY        0x8410
#define CYAN        0x07FF
#define MAGENTA     0xF81F
#define YELLOW      0xFFE0
#define WHITE       0xFFFF
#define ORANGE      0xFD20
#define DARKORANGE  0xFB60
#define MAROON      0x7800
#define BLACKM      0x18E3
#define PINK        0xFDF9
#define VIOLET      0x781F
#define CREAM       0xEF7D

//---------------------------------------DHT22 configuration and data variables
#define DHTPIN A0     
#define DHTTYPE DHT22   
DHT dht22 = DHT(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;
int T_to_Bar;

unsigned long previousMillis = 0;
const long interval = 1000;

void setup() {
  Serial.begin(115200);
  tft.begin(); 
  tft.setRotation(3); 
  drawDHT22Data();
  dht22.begin();
}

void loop() {     
  ShowDHT22Data();
  delay(1000);
}

void GetDHT22Data() {
  h = dht22.readHumidity();
  t = dht22.readTemperature();
  f = dht22.readTemperature(true);

  if (isnan(h) || isnan(t) || isnan(f)) {
    return;
  }

  hif = dht22.computeHeatIndex(f, h);
  hic = dht22.computeHeatIndex(t, h, false);
}

void draw_bar(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.fillCircle(x_bar+17, y_bar+140, 21, DARKORANGE);
  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("80");
  
  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");
}

void ShowDHT22Data() {
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    GetDHT22Data();
  }

  T_to_Bar = map(t, 0.0, 80.0, 108, 0);

  if (t>=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);
  } 
  else if (t<0) {
    tft.fillRect(x_bar_t+8, y_bar_t+8, 19, 108, WHITE);    
  }

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

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

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

  tft.setTextSize(1);
  tft.setTextColor(BLACK, WHITE);
  tft.setCursor(225, 200);  
  tft.print(hic);
  tft.print(" ");
  tft.print((char)247);
  tft.print("C");
  tft.print("  ");
  tft.setTextSize(1);
  tft.setTextColor(BLACK, WHITE);
  tft.setCursor(225, 220);   
  tft.print(hif);
  tft.print(" ");
  tft.print((char)247);
  tft.print("F");
  tft.print("  ");
}

void drawDHT22Data() {
  tft.fillScreen(WHITE);
  tft.fillRect(0, 0, 320, 40, GREEN);   
  tft.drawLine(0, 40, 320, 40, MAROON);
  tft.drawLine(0, 39, 320, 39, MAROON);  
  tft.setTextSize(2);
  tft.setTextColor(WHITE);
  tft.setCursor(25, 13);
  tft.print("Temperature & Humidity");
        
  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, BLUE);
  tft.setTextSize(2);
  tft.setTextColor(WHITE);
  tft.setCursor(205, 65);
  tft.print("Humidity");
      
  tft.fillRect(202, 140, 100, 43, RED);
  tft.setTextSize(2);
  tft.setTextColor(WHITE);
  tft.setCursor(227, 145);
  tft.print("Heat");
  tft.setCursor(220, 165);
  tft.print("Index");
}