API for the DFRobot MQ4 Gas Sensor. More...

Detailed Description

ID: mq4
Name: DFRobot MQ4 Gas Sensor
Category: gaseous
Manufacturer: dfrobot
Connection: analog

The MQ4 Gas Sensor module is useful for detecting CH4 (Methane), and natural gas concentrations in the air. It has a detection range of 100-10000 ppm.

For optimum use, it requires calibration after a pre-heat time of at least 24 hours. See the datasheet for details.

Public Member Functions
synchronized void	delete ()

	MQ4 (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)