HDXXVXTA Class Reference

API for the Veris HDXXVXTA Humidity Transmitter. More...

Detailed Description

• ID: hdxxvxta
• Name: Veris HDXXVXTA Temperature/humidity Transmitter
• Category: temp
• Manufacturer: veris
• Connection: analog
• Link: http://www.veris.com/Item/HD2NVSTA1.aspx

The driver was developed using the HD2NVSTA1 humidity transmitter. The 'T' variant supports a temperature transmitter as well. Both signals are provided by the device as analog 0-5Vdc or 0-10Vdc outputs. The A1 variant supports a temperature range of -40C-50C, while the A2 variant supports a range of 0C-50C. Humidity ranges for all devices in this device family range from 0% to 100% (non-condensing).

This driver used the 5Vdc outputs for obvious reasons. Your MCU must be configured for 5V operation. Using any other analog reference voltage will require the appropriate external circuitry (such as a voltage divider) in order to interface safely with your MCU.

For devices which do not support temperature, use '-1' as the temperature pin number in the object constructor. If temperature measurement is disabled, getTemperature() will always return 0C/32F.

    cout << "Initializing..." << endl;

    // Instantiate an HDXXVXTA instance, using A1 for humidity and A0
    // for temperature
    upm::HDXXVXTA sensor(1, 0);

    // update and print available values every second
    while (shouldRun) {
        // update our values from the sensor
        sensor.update();

        // we show both C and F for temperature
        cout << "Temperature: " << sensor.getTemperature() << " C / " << sensor.getTemperature(true)
             << " F" << endl;

        cout << "Humidity: " << sensor.getHumidity() << " %" << endl;

        cout << endl;

        upm_delay(1);
    }

    cout << "Exiting..." << endl;

Public Types
enum	RANGE_T { RANGE_MINUS40_50 = 1, RANGE_0_50 = 2 }

Public Member Functions
	HDXXVXTA (int hPin, int tPin, float aref=HDXXVXTA_DEFAULT_AREF)
	~HDXXVXTA ()
void	setRange (RANGE_T range=RANGE_MINUS40_50)
void	update ()
float	getTemperature (bool fahrenheit=false)
float	getHumidity ()

Protected Attributes
mraa::Aio	m_aioHum
mraa::Aio *	m_aioTemp

Constructor & Destructor Documentation

HDXXVXTA	(	int	hPin,
		int	tPin,
		float	aref = HDXXVXTA_DEFAULT_AREF
	)

HDXXVXTA object constructor

Parameters

hPin	Analog pin to use for the humidity measurement
tPin	Analog pin to use for temperature. If your device does not support temperature, use -1 as the value so that temperature will not be queried and an analog pin won't be wasted.
aref	The analog reference voltage, default 5.0

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~HDXXVXTA

(

)

HDXXVXTA object destructor

Member Function Documentation

void setRange ( RANGE_T  range = RANGE_MINUS40_50 )

inline

Set the temperature range of the sensor. HD*A1 sensors support a range of -40C-50C, while HD*A2 devices support a temperature range of 0C-50C. The constructor sets a default of RANGE_MINUS40_50.

Parameters

range

One of the RANGE_T values, default is RANGE_MINUS40_50

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void update

(

void

)

Read current values from the sensor and update internal stored values. This method must be called prior to querying any values, such as temperature or humidity.

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float getTemperature

(

bool

fahrenheit = false

)

Get the current temperature. update() must have been called prior to calling this method. If temperature measurement was disabled (by passing -1 as the temperature pin in the constructor) then this function will always return 0C/32F.

Parameters

fahrenheit

true to return the temperature in degrees fahrenheit, false to return the temperature in degrees celsius. The default is false (degrees Celsius).

Returns

The last temperature reading in Celsius or Fahrenheit

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float getHumidity

(

void

)

Get the current relative humidity. update() must have been called prior to calling this method.

Returns

The last humidity reading

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

• src/hdxxvxta/hdxxvxta.hpp
• src/hdxxvxta/hdxxvxta.cxx