SHT1X Temperature and Humidity Sensor. More...

Detailed Description

ID: sht1x
Name: SHT1X Temperature and Humidity Sensor
Category: temp
Manufacturer: dfrobot
Connection: gpio

This driver was tested with a DFRobot SHT10 Temperature and Humidity sensor. This driver should work on all SHT1X devices.

It requires a 10K pull-up resistor connected to the data pin. The sensor can be run at differing voltages from 2.5v to 5v.

  // Instantiate a SHT1X sensor using D2 as the clock, and D3 as the
  // data pin.
  upm::SHT1X *sensor = new upm::SHT1X(2, 3);
  // Every 2 seconds, update and print values
  while (shouldRun)
    {
      sensor->update();
      cout << "Temperature: "
           << sensor->getTemperature()
           << " C"
           << endl;
      cout << "Humidity:    "
           << sensor->getHumidity()
           << " RH"
           << endl;
      cout << endl;
      sleep(2);
    }

Public Member Functions
	SHT1X (unsigned int clk_pin, unsigned int data_pin)

	~SHT1X ()

void	reset ()

void	update ()

float	getTemperature ()

float	getHumidity ()

uint8_t	readStatus ()

upm_result_t	writeStatus (uint8_t status)

void	setVolts (SHT1X_VOLTS_T volts)

Protected Member Functions
upm_result_t	sendCommand (SHT1X_CMD_T cmd)

upm_result_t	waitForResponse ()

void	startXmit ()

uint8_t	read8Bits ()

upm_result_t	write8Bits (uint8_t byte)

Protected Attributes
sht1x_context	m_sht1x

Constructor & Destructor Documentation

SHT1X	(	unsigned int	clk_pin,
		unsigned int	data_pin
	)

SHT1X object constructor

Parameters

clk_pin	Specify the GPIO pin to use for the clock.
data_pin	Specify the GPIO pin to use for data.

~SHT1X ( )

SHT1X object destructor

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Member Function Documentation

void reset ( )

Perform a soft reset of the device.

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void update ( void )

Query the device and store the latest values. You must call this function before querying the temperature or the humidity.

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float getTemperature ( void )

Query the temperature in degrees Celsius. update() must have been called prior to calling this function.

Returns: The temperature in Celsius

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float getHumidity ( void )

Query the relative humidity. update() must have been called prior to calling this function.

Returns: The relative humidity.

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uint8_t readStatus ( )

Read the status register.

Returns: The contents of the status register.

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upm_result_t writeStatus ( uint8_t status )

Write a value to the status register.

Parameters

status The uint8_t to write to the register.

Returns: UPM result

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void setVolts ( SHT1X_VOLTS_T volts )

The Vdd voltage the sensor is being driven at can affect the temperature measurements. This function allows you to specify a voltage as close as you are using to power the sensor, so that the appropriate compensation can be made. By default, the coefficients are set for 5v operation.

Parameters

volts One of the SHT1X_VOLTS_T values.

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upm_result_t sendCommand ( SHT1X_CMD_T cmd )

protected

Send a command to the device. This is a low level command that should not be used directly unless you know exactly what you are doing.

Parameters

cmd	One of the SHT1X_CMD_T values.

Returns: UPM result

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upm_result_t waitForResponse ( )

protected

Wait for the appropriate response when starting a temperature or humidity measurement. This is a low level command that should not be used directly unless you know exactly what you are doing.