InclineDetector.h

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#ifndef INCLINEDETECTOR_H
#define INCLINEDETECTOR_H
 
#if defined(ARDUINO_ARDUINO_NANO33BLE)
#include "Arduino.h"
// Average stair ascent should be ~0.006 Pa/sample at 500 Hz
#define DEFAULT_ALPHA 0.01f
#define SMOOTH_ALPHA 0.025f
#define DEFAULT_THRESHOLD 1.5f
#define INCLINE_DELTA_MS 10 // ms
 
typedef enum
{
    Incline = 0,
    Decline = 1,
    Level = 2,
    incline_state_LENGTH
} incline_state_t;
 
class InclineDetector
{
    public:
        InclineDetector(float alpha = DEFAULT_ALPHA, float threshold = DEFAULT_THRESHOLD);
 
        incline_state_t run(float pressure);
 
        incline_state_t getInclineState();
 
        void setAlpha(float alpha);
        void setThreshold(float threshold);
 
    private:
 
        incline_state_t _state;
 
        float _avgPressure;
 
        float _alpha;
        float _threshold;
 
        float _smooth_demeanedPressure;
 
        float _smooth_alpha;
};
 
#endif // ARDUINO_ARDUINO_NANO33BLE
#endif // INCLINEDETECTOR_H