C++ API for MQ3 gas sensor. More...

Detailed Description

The Grove MQ3 Gas Sensor module is useful for gas leakage detecting (in home and industry). It can detect Alcohol Vapour and Benzine. It's highly sensitive but has a long warmup time of about 1minute. It's detect rate is of 0.04-4mg/L Alcohol.

int
main(int argc, char **argv)
{
    sensor = new upm::MQ3(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, 5);
            if (thresh) {
                // do something ....
            }
        }
    }
    std::cout << "exiting application" << std::endl;
    delete sensor;
    return 0;
}

Public Member Functions
	MQ3 (int gasPin)

	~MQ3 ()

std::string	name ()

Public Member Functions inherited from Gas
	Gas (int gasPin)

	~Gas ()

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

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

virtual int	getSampledData (thresholdContext *ctx)

virtual int	getSample (thresholdContext *ctx)

virtual void	printGraph (thresholdContext *ctx, uint8_t resolution)