Microphone Class Reference

C++ API for Microphone. More...

Detailed Description

This file defines the Microphone Analog sensor

int
main(int argc, char **argv)
{
    sensor = new upm::Microphone(0);
    signal(SIGINT, sig_handler);

    thresholdContext ctx;
    ctx.averageReading = 0;
    ctx.runningAverage = 0;
    ctx.averagedOver   = 2;

    while (!is_running) {
        int len = sensor->getSampledWindow (2, 128, buffer);
        if (len) {
            int thresh = sensor->findThreshold (&ctx, 30, buffer, len);
            sensor->printGraph(&ctx);
            if (thresh) {
                // do something ....
            }
        }
    }

    std::cout << "exiting application" << std::endl;

    delete sensor;

    return 0;
}

Public Member Functions
	Microphone (int micPin)
	~Microphone ()
int	getSampledWindow (unsigned int freqMS, unsigned int numberOfSamples, uint16_t *buffer)
int	findThreshold (thresholdContext *ctx, unsigned int threshold, uint16_t *buffer, unsigned int len)
void	printGraph (thresholdContext *ctx)

Constructor & Destructor Documentation

Microphone

(

int

micPin

)

Instanciates a Microphone object

Parameters

micPin

pin where microphone is connected

~Microphone

(

)

MAX31723 object destructor

Member Function Documentation

int getSampledWindow	(	unsigned int	freqMS,
		unsigned int	numberOfSamples,
		uint16_t *	buffer
	)

Get samples from microphone according to provided window and number of samples

Parameters

freqMS	time between each sample (in microseconds)
numberOfSamples	number of sample to sample for this window
buffer	bufer with sampled data

int findThreshold	(	thresholdContext *	ctx,
		unsigned int	threshold,
		uint16_t *	buffer,
		unsigned int	len
	)

Given sampled buffer this method will return TRUE/FALSE if threshold was reached

Parameters

ctx	threshold context
threshold	sample threshold
buffer	buffer with samples
len	bufer len

void printGraph

(

thresholdContext *

ctx

)

Print running average of threshold context

Parameters

ctx	threshold context

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The documentation for this class was generated from the following files:

• /var/lib/jenkins/workspace/upm-doc/src/mic/mic.h
• /var/lib/jenkins/workspace/upm-doc/src/mic/mic.cxx