File content as of revision 0:69293b19ee19:

/**
 * EE 4391 Senior Design
 * Professor Hinkle and Dr. Compeau
 * @author Team Eta
 * Texas State University
 *
 * @section DESCRIPTION
 *
 * Honeywell HTU21D Humidity and Temperature sensor.
 * Datasheet, specs, and information:
 * https://cdn.sparkfun.com/assets/6/a/8/e/f/525778d4757b7f50398b4567.pdf
 */

#ifndef HTU21D_H
#define HTU21D_H

/**
 * Includes
 */
#include "mbed.h"

/**
 * Defines
 */
// Acquired from Datasheet.

#define HTU21D_I2C_ADDRESS  0x40 
#define TRIGGER_TEMP_MEASURE  0xE3
#define TRIGGER_HUMD_MEASURE  0xE5


//Commands.
#define HTU21D_EEPROM_WRITE 0x80
#define HTU21D_EEPROM_READ  0x81


/**
 * Honeywell HTU21D digital humidity and temperature sensor.
 */
class HTU21D {

public:

    /**
     * Constructor.
     *
     * @param sda mbed pin to use for SDA line of I2C interface.
     * @param scl mbed pin to use for SCL line of I2C interface.
     */
    HTU21D(PinName sda, PinName scl);


    //Samples the temperature, input void, outputs an int in celcius.
    int sample_ctemp(void);
    
       //Samples the temperature, input void, outputs an int in fahrenheit.
    int sample_ftemp(void);
    
       //Samples the temperature, input void, outputs an int in kelvin.
    int sample_ktemp(void);
    
    //Samples the humidity, input void, outputs and int.
    int sample_humid(void);

   

private:

    I2C* i2c_;

    /**
     * Write to EEPROM or RAM on the device.
     *
     * @param EepromOrRam 0x80 -> Writing to EEPROM
     * @param address Address to write to.
     * @param data Data to write.
     */
    void write(int EepromOrRam, int address, int data);

    /**
     * Read EEPROM or RAM on the device.
     *
     * @param EepromOrRam 0x81 -> Reading from EEPROM
     * @param address Address to read from.
     * @return The contents of the memory address.
     */
    int read(int EepromOrRam, int address);

};

#endif /* HTU21D_H */