RHUSB Class Reference

UPM API for the Omega RH-USB Temperature and Humidity Sensor. More...

Detailed Description

• ID: rhusb
• Name: Omega RH-USB Temperature and Humidity Sensor
• Category: temp
• Manufacturer: omega
• Connection: uart
• Link: http://www.omega.com/pptst/RH-USB.html

This module implements support for the Omega RH-USB Temperature and Humidity Sensor Probe. It connects via an integrated USB cable, and is accessed via a serial port. It is suitable for wall or duct mounting.

  string defaultDev = "/dev/ttyUSB0";

  // if an argument was specified, use it as the device instead
  if (argc > 1)
    defaultDev = string(argv[1]);

  cout << "Using device " << defaultDev << endl;
  cout << "Initializing..." << endl;

  // Instantiate an RHUSB instance on defaultDev
  upm::RHUSB sensor(defaultDev);

  // output the firmware ID
  cout << "Firmware ID: " << sensor.getFirmwareID() << endl;
  cout << endl;

  // 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;

      sleep(1);
    }


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

Public Member Functions
	RHUSB (std::string device)
	~RHUSB ()
void	update ()
float	getTemperature (bool fahrenheit=false)
float	getHumidity ()
std::string	getFirmwareID ()

Protected Member Functions
bool	dataAvailable (unsigned int millis)
int	writeStr (std::string data)
std::string	readStr (int len)
std::string	sendCommand (std::string cmd)

Protected Attributes
mraa::Uart	m_uart

Constructor & Destructor Documentation

RHUSB

(

std::string

device

)

RHUSB constructor

Parameters

device

Path to the serial device

~RHUSB

(

)

RHUSB Destructor

Member Function Documentation

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.

float getTemperature

(

bool

fahrenheit = false

)

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

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

float getHumidity

(

void

)

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

Returns

The last humidity reading

string getFirmwareID

(

)

Get the firmware identification string.

Returns

The firmware identification

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

• src/rhusb/rhusb.hpp
• src/rhusb/rhusb.cxx