MQ303A Class Reference

C++ API for the MQ303A Alcohol Sensor. More...

Detailed Description

• ID: mq303a
• Name: mq303a Alcohol Sensor
• Category: gaseous
• Manufacturer: seeed
• Link: http://www.seeedstudio.com/wiki/Grove_-_Alcohol_Sensor
• Connection: analog gpio

UPM module for the MQ303A Alcohol Sensor. This sensor needs to be warmed up before stable results are obtained. The higher the value returned from value(), the higher the amount of alcohol that was detected.

  // Instantiate an mq303a sensor on analog pin A0

  // This device uses a heater powered from an analog I/O pin. 
  // If using A0 as the data pin, then you need to use A1, as the heater
  // pin (if using a grove mq303a).  For A1, we can use the D15 gpio, 
  // setup as an output, and drive it low to power the heater.

  upm::MQ303A *mq303a = new upm::MQ303A(0, 15);
  
  cout << "Enabling heater and waiting 2 minutes for warmup." << endl;
  mq303a->heaterEnable(true);
  sleep(120);

  cout << "This sensor may need to warm until the value drops below about 450." 
       << endl;

  // Print the detected alcohol value every second
  while (shouldRun)
    {
      int val = mq303a->value();

      cout << "Alcohol detected (higher means stronger alcohol): " 
           << val << endl;

      sleep(1);
    }

Public Member Functions
	MQ303A (int pin, int heaterPin)
	~MQ303A ()
int	value ()
void	heaterEnable (bool enable)

Constructor & Destructor Documentation

MQ303A	(	int	pin,
		int	heaterPin
	)

MQ303A sensor constructor

Parameters

pin	analog pin to use
heaterPin	digital pin mapped to analog pin to use

~MQ303A

(

)

MQ303A Destructor

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Member Function Documentation

int value

(

)

Get the alcohol detected from the sensor. The value read from the analog pin is inverted. A higher returned value means a higher amount of alcohol was detected.

Returns

the alcohol reading

void heaterEnable

(

bool

enable

)

Enable the heater.

Parameters

enable

if true, enable the heater else disable

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

• /var/lib/jenkins/workspace/upm-doc-stable/src/mq303a/mq303a.h
• /var/lib/jenkins/workspace/upm-doc-stable/src/mq303a/mq303a.cxx