#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

Adafruit_SSD1306 display = Adafruit_SSD1306(128, 64, &Wire);

unsigned int readDHT22(int pin, float* Hum, float* Tem);
int readByte(int pin);
int checkSum(int pin);

const unsigned char PROGMEM weather[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x04,
0x10, 0x00, 0x27, 0xA0, 0x00, 0x1C, 0x0E, 0x00, 0x08, 0x30, 0x80, 0x50, 0x40, 0x40, 0x10, 0x80,
0x20, 0x10, 0x80, 0x78, 0x31, 0x80, 0x84, 0x0C, 0x40, 0x02, 0x00, 0x00, 0x00, 0x10, 0x00, 0x01,
0x10, 0x00, 0x01, 0x10, 0x00, 0x00, 0x10, 0x00, 0x02, 0x08, 0x00, 0x04, 0x03, 0xFF, 0xF0, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
};
const unsigned char PROGMEM clock[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFE, 0x00, 0x03, 0xFF, 0x80, 0x07,
0x81, 0xC0, 0x0E, 0x00, 0xE0, 0x0C, 0x10, 0x60, 0x1C, 0x18, 0x30, 0x18, 0x18, 0x30, 0x18, 0x18,
0x30, 0x18, 0x18, 0x10, 0x18, 0x1C, 0x30, 0x18, 0x0E, 0x30, 0x18, 0x06, 0x30, 0x0C, 0x00, 0x60,
0x0E, 0x00, 0x60, 0x07, 0x01, 0xC0, 0x03, 0xFF, 0x80, 0x00, 0xFE, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
};

void setup() {
 
  display.begin(SSD1306_SWITCHCAPVCC,0x3c);
  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);
  display.clearDisplay();
  display.setTextSize(2); 
  display.setCursor(40, 10);
  display.print("12:35pm");
  display.drawRoundRect(0,0,128,64,7,1);
  display.drawLine(0,32,128,32,1);
  display.drawBitmap(2,32,weather,24,24,1);
  display.drawBitmap(2,3,clock,24,24,1);
  Serial.begin(9600);
  // put your setup code here, to run once:
  float h,t;
  readDHT22(2,&h,&t);
  Serial.println(h);
  Serial.println(t);
}

void loop() {
  float h,t;
  readDHT22(2,&h,&t);

  //display.fillRect(35,5,90,22,0);//<< clear zone time
  display.fillRect(35,36,90,22,0);//<< clear zone weather
  display.setTextSize(2);
  display.setCursor(35, 40);
  display.print((int)h);
  display.print("%");
  display.setCursor(80, 40);
  display.print((int)t);
  display.print("C");
  display.display();
  delay(2000);

  // put your main code here, to run repeatedly:

}

unsigned int readDHT22(int pin, float* Hum, float* Tem){
  unsigned int status = 0;
  pinMode(pin,OUTPUT);
  digitalWrite(pin,LOW);
  delay(2);
  digitalWrite(pin,HIGH);
  delayMicroseconds(30);
  pinMode(pin,INPUT);

  while(digitalRead(pin));
  while(!digitalRead(pin));
  while(digitalRead(pin));

  int i = 32;
  long int HT = 0;
  do{
    while(!digitalRead(pin));
    delayMicroseconds(30);
    if(digitalRead(pin)){
      HT = ((HT<<1) | 1);
    }else{
      HT = (HT<<1);
    }
    while(digitalRead(pin));
    i--;
  }while(i != 0);

  unsigned char cSum = 0;
  i = 8;
  do{
    while(!digitalRead(pin));
    delayMicroseconds(30);
    if(digitalRead(pin)){
      cSum = ((cSum<<1) | 1);
    }else{
      cSum = (cSum<<1);
    }
    while(digitalRead(pin));
    i--;
  }while(i != 0);

  int H = ((0xFFFF0000 & HT)>>16);
  int T = ((0xFFFF & HT));

  unsigned char HH = ((0xFF00 & H)>>8);
  unsigned char HL = (0xFF & H);
  unsigned char TH = ((0xFF00 & T)>>8);
  unsigned char TL = (0xFF & T);

  unsigned char checkSum = (HH+HL+TH+TL);

  if(checkSum && cSum){
    *Hum = H;
    *Hum /= 10;
    *Tem = T;
    *Tem /= 10;
  }else{
    status = 1;
  }
  return status;
}