#include "DHT.h"
#define DHT11Pin 2
#define DHTType DHT11
//OLED
#include   <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

DHT   HT(DHT11Pin,DHTType);
float humi;
float tempC;
float tempF;

//OLED   define
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT   64 // OLED display height, in pixels
// Declaration for an SSD1306 display connected   to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,   &Wire, -1);

void setup() {
  Serial.begin(9600);
  //For DHT11
   HT.begin();
  //For OLED I2C
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C))   { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
     for(;;);
  }
  display.display(); //Display logo
  delay(1000); 
   display.clearDisplay();
}

void loop() {
 delay(1000);
 humi =   HT.readHumidity();
 tempC = HT.readTemperature();
 tempF = HT.readTemperature(true);

   Serial.print("Humidity:");
 Serial.print(humi,0);
 Serial.print("%");
   Serial.print(" Temperature:");
 Serial.print(tempC,1);
 Serial.print("C   ~ ");
 Serial.print(tempF,1);
 Serial.println("F");

 display.clearDisplay();
   oledDisplayHeader();
 

 oledDisplay(3,5,28,humi,"%");
 oledDisplay(2,70,16,tempC,"C");
   oledDisplay(2,70,44,tempF,"F");
 
 display.display(); 
 
}
void   oledDisplayHeader(){
 display.setTextSize(1);
 display.setTextColor(WHITE);
   display.setCursor(0, 0);
 display.print("Humidity");
 display.setCursor(60,   0);
 display.print("Temperature");
}
void oledDisplay(int size, int x,int   y, float value, String unit){
 int charLen=12;
 int xo=x+charLen*3.2;
   int xunit=x+charLen*3.6;
 int xval = x; 
 display.setTextSize(size);
 display.setTextColor(WHITE);
   
 if (unit=="%"){
   display.setCursor(x, y);
   display.print(value,0);
    display.print(unit);
 } else {
   if (value>99){
    xval=x;
   }   else {
    xval=x+charLen;
   }
   display.setCursor(xval, y);
   display.print(value,0);
    display.drawCircle(xo, y+2, 2, WHITE);  // print degree symbols (  )
   display.setCursor(xunit,   y);
   display.print(unit);
 }
 
}