#include "DHT.h"
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

#define SN 221
#define DHTPIN 2     // what digital pin we're connected to
//#define DHTTYPE DHT11   // DHT 11
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
//#define DHTTYPE DHT21   // DHT 21 (AM2301)

DHT dht(DHTPIN, DHTTYPE);

unsigned long interval = 4000;
unsigned long prev_millis = 0;

#if defined(ARDUINO) && ARDUINO >= 100
#define printByte(args)  write(args);
#else
#define printByte(args)  print(args,BYTE);
#endif

uint8_t bell[8]  = {0x4,0xe,0xe,0xe,0x1f,0x0,0x4};
uint8_t note[8]  = {0x2,0x3,0x2,0xe,0x1e,0xc,0x0};
uint8_t clockie[8] = {0x0,0xe,0x15,0x17,0x11,0xe,0x0};
uint8_t heart[8] = {0x0,0xa,0x1f,0x1f,0xe,0x4,0x0};
uint8_t duck[8]  = {0x0,0xc,0x1d,0xf,0xf,0x6,0x0};
uint8_t check[8] = {0x0,0x1,0x3,0x16,0x1c,0x8,0x0};
uint8_t cross[8] = {0x0,0x1b,0xe,0x4,0xe,0x1b,0x0};
uint8_t retarrow[8] = {	0x1,0x1,0x5,0x9,0x1f,0x8,0x4};

byte customChar[8] = {
  0b10000,
  0b11000,
  0b11100,
  0b11110,
  0b11111,
  0b11111,
  0b11111,
  0b11111
};

byte deg_of_c[8] = {
  0b01000,
  0b10100,
  0b01000,
  0b00011,
  0b00100,
  0b00100,
  0b00100,
  0b00011
};

LiquidCrystal_I2C lcd(0x3f,16,2);  // set the LCD address to 0x27 for a 16 chars and 2 line display

void displayKeyCodes(void)
{
  uint8_t i = 0;
  lcd.clear();
  lcd.print("Codes 0x");
  lcd.print(i, HEX);
  lcd.print("-0x");
  lcd.print(i+16, HEX);
  lcd.setCursor(0, 1);

  for (int j=0; j<16; j++) {
    lcd.printByte(i+j);
  }

  i += 16;
}

void setup()
{
  Serial.begin(9600);

  dht.begin();

  lcd.init();                      // initialize the lcd
  lcd.backlight();

  lcd.createChar(0, bell);
  lcd.createChar(1, note);
  lcd.createChar(2, clockie);
  lcd.createChar(3, heart);
  lcd.createChar(4, duck);
  lcd.createChar(5, check);
  lcd.createChar(6, cross);
  lcd.createChar(7, retarrow);
  lcd.createChar(8, customChar);
  lcd.home();

  lcd.print("Hello world...");
  lcd.setCursor(0, 1);
  lcd.print(" i ");
  lcd.printByte(3);
  lcd.print(" arduinos!");

  prev_millis = millis();
}

void loop()
{
  unsigned long curr_millis = millis();

  if ((unsigned long)(curr_millis - prev_millis) < interval) {
    if (Serial.available()) {
      delay(100);
      lcd.clear();

      while (Serial.available() > 0) {
        lcd.write(Serial.read());
      }
    }
  } else {
    Serial.println("hi");
    prev_millis = millis();

    float h = dht.readHumidity();
    float t = dht.readTemperature();

    if (isnan(h) || isnan(t)) {
      Serial.println("Failed to read from DHT sensor!");
    }

    Serial.print("type:DHT,");
    Serial.print("sn:");
    Serial.print(SN);
    Serial.print(",");
    Serial.print("hum:");
    Serial.print(h);
    Serial.print(",");
    Serial.print("temp:");
    Serial.print(t);
    Serial.println(";");
  }
}