/*
   Sketch to display humidity and temperature
   Written by R. Jordan Kreindler
   Sketch: November 9,2020
   
   Uses a 0.96 inch OLED to display Humidity, as well as Fahrenheit and Centigrade
      room Temperatures.

   The DHT22 sensor provides Centigrade temperature values which are easily
     converted to Fahrenheit temperature values
*/

#include <U8g2lib.h>

U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, SCL, SDA, U8X8_PIN_NONE);
/*
  U8G2_R0 No rotation, landscape
  U8G2_R1 90 degree clockwise rotation // Moves us to portrait
  U8G2_R2 180 degree clockwise rotation
  U8G2_R3 270 degree clockwise rotation
*/

#include <DHT.h>
int DHTData = 3; // The data pin from the DHT22 is digital pin 3
DHT dht(DHTData, DHT22);// Define a DHT object, dht
int humidity = 0; // Holds humidity results as an integer
int cTemp = 0.0; // Holds Centigrade temerature results as a float
int centigradeTemp = 0; // The Centigrade temperature after conversion to int
int fahrenheitTemp = 0; // Will hold the converted to Fahenheit temperature

int i = 0; // A for loop index

int delay1 = 4000; // The time between text displays

void setup() {
  u8g2.begin();
  u8g2.setFont(u8g2_font_luRS14_te); // Set Font
  dht.begin(); //Start the DHT22 sensor
}

void loop()
{
  u8g2.drawStr(02, 21, "RH:"); // Display resolution is 128 x 64
  humidity = round(dht.readHumidity());
  u8g2.setCursor(40, 21);
  u8g2.print(humidity);

  u8g2.drawStr(02, 42, "C:"); 
  u8g2.setCursor(40,42); 
  cTemp = dht.readTemperature();
  fahrenheitTemp = cTemp * 9.0 / 5.0 + 32.0;
  u8g2.print(centigradeTemp);
  
  centigradeTemp = round(cTemp);
  u8g2.drawStr(02, 63 , "F:");
  u8g2.setCursor(40, 63);
  u8g2.print(fahrenheitTemp);
  
  u8g2.sendBuffer();
}

}