API for the Grove MQ2 Gas Sensor. More...

Detailed Description

ID: mq2
Name: Grove MQ2 Gas Sensor
Category: gaseous
Manufacturer: seeed
Connection: analog
Kit: hak

The Grove MQ2 Gas Sensor module is useful for gas leakage detection (in home and industry). It can detect LPG, i-butane, methane, alcohol, hydrogen, smoke, and other combustible gases. It's a medium-sensitivity sensor with a detection range of 300-10,000 ppm.

        short[] buffer = new short[128];
        // Attach gas sensor to A0
        upm_gas.MQ2 sensor = new upm_gas.MQ2(0);
        upm_gas.thresholdContext ctx = new upm_gas.thresholdContext();
        ctx.setAverageReading(0);
        ctx.setRunningAverage(0);
        ctx.setAveragedOver(2);
        while (true) {
            int len = sensor.getSampledWindow(2, buffer);
            if (len != 0) {
                int thresh = sensor.findThreshold(ctx, 30, buffer);
                sensor.printGraph(ctx, resolution);
                if (thresh != 0) {
                    System.out.println("---Threshold reached---");
                }
            }
            Thread.sleep(1000);
        }

Public Member Functions
synchronized void	delete ()

	MQ2 (int gasPin)

String	name ()

Public Member Functions inherited from Gas
synchronized void	delete ()

	Gas (int gasPin)

int	getSampledWindow (long freqMS, short[] numberOfSamples)

int	findThreshold (thresholdContext ctx, long threshold, short[] buffer)

int	getSampledData (thresholdContext ctx)

int	getSample ()

void	printGraph (thresholdContext ctx, short resolution)