Digital_Relative_Humidity_Temperature_HTU21D.ino

/*
  HTU21D Humidity Sensor Example Code
  By: Nathan Seidle
  SparkFun Electronics
  Date: September 15th, 2013
  License: This code is public domain but you buy me a beer if you use this and we meet someday (Beerware license).

  Uses the HTU21D library to display the current humidity and temperature

  Open serial monitor at 9600 baud to see readings. Errors 998 if not sensor is detected. Error 999 if CRC is bad.

  Hardware Connections (Breakoutboard to Arduino):
  -VCC = 3.3V
  -GND = GND
  -SDA = A4 (use inline 330 ohm resistor if your board is 5V)
  -SCL = A5 (use inline 330 ohm resistor if your board is 5V)

*/

#include <Wire.h>
#include "SparkFunHTU21D.h" // include HTU21D library
#include <SFE_MicroOLED.h>  // Include the SFE_MicroOLED library
#define PIN_RESET 7
#define DC_JUMPER 1
MicroOLED oled(PIN_RESET, DC_JUMPER);    // I2C declaration

//Create an instance of the object
HTU21D myHumidity;

void setup()
{
  Serial.begin(9600);
  Serial.println("HTU21D Example!");

  delay(100);
  myHumidity.begin();

  oled.begin();    // Initialize the OLED
  oled.clear(ALL); // Clear the display's internal memory
  oled.display();  // Display what's in the buffer (splashscreen)
  delay(1000);     // Delay 1000 ms
  oled.clear(PAGE); // Clear the buffer.
}

void loop()
{
  float humd = myHumidity.readHumidity();
  float temp_C = myHumidity.readTemperature();
  float temp_F = temp_C * (9.0 / 5.0) + 32.0;

  oled.clear(PAGE);            // Clear the display
  oled.setCursor(0, 0);        // Set cursor to top-left
  oled.setFontType(0);         // Smallest font
  oled.print(" Relative");   // Print

  oled.setCursor(0, 8);        // Set cursor to top-left
  oled.print("  Humidity");   // Print


  oled.setCursor(0, 19);       // Set cursor to middle-ish
  oled.print(temp_F);           // Print temp, assuming that it is within room temp in tens
  oled.print(" degF");          // Print


  oled.setCursor(0, 30);       // Set cursor to middle-ish
  oled.print(temp_C);           // Print temp, assuming that it is within room temp in tens
  oled.print(" degC");          // Print

  oled.setCursor(0, 41);       // Set cursor to middle-ish
  oled.print("  ");          // Print
  oled.print(humd);           // Print temp, assuming that it is within room temp in tens
  oled.print(" %");          // Print
  oled.setFontType(0);         // Smallest font

  oled.display();

  Serial.print("Time:");
  Serial.print(millis());
  Serial.print(" Temperature:");
  Serial.print(temp_C, 1);
  Serial.print("C ");
  Serial.print(temp_F, 1);
  Serial.print("F");
  Serial.print(" Humidity:");
  Serial.print(humd, 1);
  Serial.print("%");

  Serial.println();
  delay(1000);
}