File content as of revision 0:964a928b323e:

#ifndef AIR
#define AIR

#include "mbed.h"

/// The load resistance on the board
#define RLOAD 10.0
/// Calibration resistance at atmospheric CO2 level
#define RZERO 76.63
/// Parameters for calculating ppm of CO2 from sensor resistance
#define PARA 116.6020682
#define PARB 2.769034857

/// Parameters to model temperature and humidity dependence
#define CORA 0.00035
#define CORB 0.02718
#define CORC 1.39538
#define CORD 0.0018

/// Atmospheric CO2 level for calibration purposes
#define ATMOCO2 397.13

class Air {
 private:
    AnalogIn _pin;
 public:
    Air (PinName pin);
    float getCorrectionFactor(float t, float h);
    float getResistance();
    float getCorrectedResistance(float t, float h);
    float getPPM();
    float getCorrectedPPM(float t, float h);
    float getRZero();
    float getCorrectedRZero(float t, float h);
};
#endif