hdxxvxta.h

/*
 * Author: Jon Trulson <jtrulson@ics.com>
 * Copyright (c) 2016 Intel Corporation.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#pragma once

#include <string>
#include <iostream>

#include <mraa/aio.hpp>

// Unlikey to be changable without external circuitry (voltage divider)
#define HDXXVXTA_DEFAULT_AREF 5.0

namespace upm {
  class HDXXVXTA {
  public:

    typedef enum {
      // *A1 series (-40C-50C)
      RANGE_MINUS40_50                      = 1,
      // *A2 series (0C-50C)
      RANGE_0_50                            = 2
    } RANGE_T;

    HDXXVXTA(int hPin, int tPin, float aref=HDXXVXTA_DEFAULT_AREF);

    ~HDXXVXTA();

    void setRange(RANGE_T range=RANGE_MINUS40_50)
    {
      m_range = range;
    };

    void update();

    float getTemperature(bool fahrenheit=false);

    float getHumidity();


  protected:
    // temperature is an optional feature of the humidity transmitter
    mraa::Aio *m_aioTemp;

    mraa::Aio m_aioHum;

  private:
    float m_aref;
    int m_aResTemp;
    int m_aResHum;

    // does this sensor support temperature reporting?
    bool m_hasTemp;

    // in Celcius
    float m_temperature;

    float m_humidity;

    RANGE_T m_range;
  };
}