cwlsxxa.hpp

/*
 * 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 CWLSXXA_DEFAULT_AREF 5.0

namespace upm {
  class CWLSXXA {
  public:

    CWLSXXA(int gPin, int hPin, int tPin, float rResistor=0.0,
            float aref=CWLSXXA_DEFAULT_AREF);

    ~CWLSXXA();

    void update();

    float getTemperature(bool fahrenheit=false);

    float getHumidity();

    float getCO2();


  protected:
    // temperature and humidity are optional features of this transmitter
    mraa::Aio *m_aioTemp;
    mraa::Aio *m_aioHum;

    // CO2 reporting is always supported
    mraa::Aio m_aioCO2;

  private:
    float m_aref;
    float m_rResistor;
    int m_aResTemp;
    int m_aResHum;
    int m_aResCO2;

    // does this sensor support temperature and/or humidity reporting?
    bool m_hasTemp;
    bool m_hasHum;

    // in Celsius
    float m_temperature;

    float m_humidity;

    // in PPM
    float m_co2;

    int average(mraa::Aio *aio, int samples);
  };
}