Smoother

Smooths the incoming signal by removing fast variations and noise (high frequencies).

Example

Smooth a sensor over time.

#include <Plaquette.h>

AnalogIn sensor(A0);

// Smooths over time window of 10 seconds.
Smoother smoother(10.0);

StreamOut serialOut(Serial);

void begin() {}

void step() {
  // Smooth value and send it to serial output.
  sensor >> smoother >> serialOut;
}

Note

The filter uses an exponential moving average which corresponds to a form of low-pass filter.

Reference

class Smoother : public Node, public MovingAverage

Simple moving average transform filter.

Public Functions

Smoother(float smoothWindow = PLAQUETTE_DEFAULT_SMOOTH_WINDOW)

Constructor.

Parameters:: factor – a parameter in [0, 1] representing the importance of new values as opposed to old values (ie. lower smoothing factor means more smoothing)

virtual float put(float value)

Pushes value into the unit.

Parameters:: value – the value sent to the unit
Returns:: the new value of the unit

inline virtual float get(): Returns smoothed value.

void timeWindow(float seconds): Changes the smoothing window (expressed in seconds).

inline float timeWindow() const: Returns the smoothing window (expressed in seconds).

void cutoff(float hz): Changes the smoothing window cutoff frequency (expressed in Hz).

float cutoff() const: Returns the smoothing window cutoff frequency (expressed in Hz).

Smoother

Example

Reference

See Also