Jochen Krapf / Pulses

Measurement of low frequencys based on timing between pulses

Dependents:   Energy_Meter_S0_Example

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Pulses Class Reference
Public Types | Public Member Functions

Pulses Class Reference

A class to calculate frequencys based on timing between pulses. More...

#include <Pulses.h>

Public Types

enum  PulseType
 

Pulses type format.

More...

Public Member Functions

 Pulses (PinName inPin, PulseType type=FALL, unsigned int timeout=600, unsigned int counter=0)
 constructor of Pulses object
float getAct ()
 Gets the frequency based on the last 2 pulses.
float getAverage ()
 Gets the average of frequency based on all pulses since last call of this function.
void get (float *pAverage, float *pMin, float *pMax, float *pSum=NULL)
 Gets the average, min, max and sum of frequency based on all pulses since last call of this function.
unsigned int getCounter ()
 Gets the number of pulses from the input pin since start.
void setFactor (float factor)
 Sets the factor for the getter-functions to convert in another unit (1.0=Hz, 60.0=rpm, ...)

Detailed Description

A class to calculate frequencys based on timing between pulses.

Pulse-frequency can be about or slower than loop/aquisition time

Example:

#include "mbed.h"
#include "Pulses.h"

Pulses pulses(p8, Pulses::FALL);
Serial pc(USBTX, USBRX); // tx, rx

int main() {
    // choose on of the following unit scales
    pulses.setFactor(1.0f);   // Hz
    pulses.setFactor(60.0f);   // rpm
    pulses.setFactor(3600.0f/2000.0f);   // kWh; energy meter with SO interface - 2000 pulses per kWh
    
    while(1) {
        pc.printf ( "Pulses: act=%.3f average=%.3f   counter=%d \r\n", 
            pulses.getAct(), 
            pulses.getAverage(),
            pulses.getCounter() );
        
        wait(3.14);
    }
}

Definition at line 67 of file Pulses.h.

Member Enumeration Documentation

enum PulseType

Pulses type format.

Definition at line 71 of file Pulses.h.

Constructor & Destructor Documentation

Pulses ( PinName  inPin,
PulseType  type = FALL,
unsigned int  timeout = 600,
unsigned int  counter = 0 
) [explicit]

constructor of Pulses object

Parameters:
inPinPin number of input pin. All port pins are possible except p19 and p20
typeType of edge detection. RISE, FALL, CHANGE
timeoutTimeout in seconds to handle a stopped pulse-generator (standing motor). Max 15 minutes.
counterStart value of the internal pulses counter to offset pSum (in get()) e.g. after reboot

Definition at line 5 of file Pulses.cpp.

Member Function Documentation

void get ( float *  pAverage,
float *  pMin,
float *  pMax,
float *  pSum = NULL 
)

Gets the average, min, max and sum of frequency based on all pulses since last call of this function.

Parameters:
pAveragePointer to float value to return average frequency. Use NULL to skip param. -1 if no new pulses occurred since last call.
pMinPointer to float value to return min. frequency. Use NULL to skip param. -1 if no new pulses occurred since last call.
pMaxPointer to float value to return max. frequency. Use NULL to skip param. -1 if no new pulses occurred since last call.
pSumPointer to float value to return the accumulated average values. Use NULL to skip param.

Definition at line 65 of file Pulses.cpp.

float getAct (  )

Gets the frequency based on the last 2 pulses.

It's only a snapshot and its not representative.

Returns:
Actual frequency

Definition at line 39 of file Pulses.cpp.

float getAverage (  )

Gets the average of frequency based on all pulses since last call of this function.

Returns:
Average frequency. -1 if no new pulses occurred since last call

Definition at line 47 of file Pulses.cpp.

unsigned int getCounter (  )

Gets the number of pulses from the input pin since start.

Returns:
Number of pulses

Definition at line 112 of file Pulses.cpp.

void setFactor ( float  factor )

Sets the factor for the getter-functions to convert in another unit (1.0=Hz, 60.0=rpm, ...)

Parameters:
factorFactor to scale from Hz to user unit

Definition at line 118 of file Pulses.cpp.

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