TEX00 Class Reference

API for the Veris TEX00 Temperature Sensor. More...

Detailed Description

• ID: tex00
• Name: Veris TEX00 Temperature Sensors
• Category: temp
• Manufacturer: veris
• Connection: analog
• Link: http://www.veris.com/Item/TED00.aspx

The Veris TEX00 temperature sensor family is made up of a series of RTD thermistors in wall mount packaging.

This driver was developed using the TED00, which utilizes a 10K Ohm Type 2 thermistor. However, this driver can support the other 12 variants of the TE series as well by providing the correct sensor type to the class constructor. These other sensor types have not been tested. Only the TED00 was tested with this driver.

This sensor must be connected as part of a voltage divider, with the balancing resistor ideally matched to the sensor's 25C detection range. For the TED00 (10kt2), a 10K Ohm (1% tolerance) resistor was used in a circuit like the following:

GND o-—|TED00(10k2)|-—o-—|balanceResistor(10K)|-—o VCC (+5vdc) | | |-—o A0 (analog input to MCU)

A 3.3vdc voltage can be used as well if desired.

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

    // Instantiate an TEX00 instance, using A0 for the analog input.  In
    // this example, we are using a 10K Ohm balance resistor and a TED
    // (10k type 2) thermistor.
    upm::TEX00 sensor(0, 10000, upm::TEX00::STYPE_THERMISTOR_TED);

    cout << "Minimum temperature: " << sensor.getTemperatureRangeMin() << " C" << endl;
    cout << "Maximum temperature: " << sensor.getTemperatureRangeMax() << " C" << endl;
    cout << endl;

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

        if (sensor.isOutOfRange()) {
            cout << "Temperature out of range" << endl;
        } else {
            // we show both C and F for temperature
            cout << "Temperature: " << sensor.getTemperature() << " C / "
                 << sensor.getTemperature(true) << " F" << endl;
        }

        cout << endl;

        upm_delay(1);
    }

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

Public Types
enum	SENSOR_TYPES_T {   STYPE_THERMISTOR_TED = 0, STYPE_THERMISTOR_TEB, STYPE_THERMISTOR_TEC, STYPE_THERMISTOR_TEI,   STYPE_THERMISTOR_TEE, STYPE_THERMISTOR_TEF, STYPE_THERMISTOR_TEH, STYPE_THERMISTOR_TEJ,   STYPE_THERMISTOR_TES, STYPE_THERMISTOR_TER, STYPE_THERMISTOR_TEM, STYPE_THERMISTOR_TEU,   STYPE_THERMISTOR_TET }

Public Member Functions
	TEX00 (int tPin, float balanceResistor, SENSOR_TYPES_T stype, float aref=TEX00_DEFAULT_AREF)
	~TEX00 ()
void	update ()
float	getTemperature (bool fahrenheit=false)
float	getTemperatureRangeMin ()
float	getTemperatureRangeMax ()
bool	isOutOfRange ()

Protected Member Functions
float	thermistor (float ohms)

Protected Attributes
mraa::Aio	m_aioTemp

Constructor & Destructor Documentation

TEX00	(	int	tPin,
		float	balanceResistor,
		SENSOR_TYPES_T	stype,
		float	aref = TEX00_DEFAULT_AREF
	)

TEX00 object constructor

Parameters

tPin	Analog pin to use for temperature.
balanceResistor	Resistance (in Ohms) of the balance resistor used in your voltage divider.
stype	The sensor type. One of the SENSOR_TYPES_T values.
aref	The analog reference voltage, default 5.0

~TEX00

(

)

TEX00 object 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.

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 getTemperatureRangeMin

(

)

Return the smallest temperature that can be measured by the current sensor.

Returns

The smallest detectable temperature this sensor can measure, in C.

float getTemperatureRangeMax

(

)

Return the largest temperature that can be measured by the current sensor.

Returns

The largest detectable temperature this sensor can measure, in C.

bool isOutOfRange ( )

inline

Detect whether the last measurement exceeded the sensors detection range. update() must have been called prior to calling this method.

Returns

true if the last measurement was out of range, false otherwise.

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

• src/tex00/tex00.hpp
• src/tex00/tex00.cxx