/*
   Sketch to display humidity and temperature
   Written by R. Jordan Kreindler, J
   Sketch: November 27,2020
   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 can be easily
     converted to Fahrenheit.
*/

#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>
#define 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

float cTemp = 0.0; // Holds Centigrade temperature results as an integer
//float centigradeTemp = 0; // The Centigrade temperature 
float fTemp = 0; // Will hold the calculated Fahenheit temperature


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

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

void loop()
{
  u8g2.setFont(u8g2_font_7x14_mf); // Set Font 10 pixels high  
  u8g2.drawStr(42,10, "RH:"); // Display resolution is 128 x 64
  humidity = round(dht.readHumidity());
  u8g2.setCursor(70, 10);
  u8g2.print(humidity);

  u8g2.setFont(u8g2_font_courR24_tf); // Set Font 

  u8g2.drawStr(02, 41, "C"); 
  u8g2.setCursor(30,41); 
  cTemp = dht.readTemperature();
  u8g2.print(cTemp);  
  u8g2.drawStr(30, 41, "      ");

  u8g2.drawStr(02, 62 , "F");
  fTemp = cTemp * 9.0 / 5.0 + 32.0;
  u8g2.setCursor(30,62); 
  u8g2.print(fTemp);
  delay(2000);
  u8g2.drawStr(30, 62, "      ");
  
  u8g2.sendBuffer();

}