DHT

Class to read data from DHT11 humidity and temperature sensor.

Public Types

Type	Name
enum	eError { DHT11 = 11, SEN11301P = 11, RHT01 = 11, DHT22 = 22, AM2302 = 22, SEN51035P = 22, RHT02 = 22, RHT03 = 22, ERROR_NONE = 0, BUS_BUSY =1, ERROR_NOT_PRESENT =2, ERROR_ACK_TOO_LONG =3, ERROR_SYNC_TIMEOUT = 4, ERROR_DATA_TIMEOUT =5, ERROR_CHECKSUM = 6, ERROR_NO_PATIENCE =7 }
enum	eError { DHT11 = 11, SEN11301P = 11, RHT01 = 11, DHT22 = 22, AM2302 = 22, SEN51035P = 22, RHT02 = 22, RHT03 = 22, ERROR_NONE = 0, BUS_BUSY =1, ERROR_NOT_PRESENT =2, ERROR_ACK_TOO_LONG =3, ERROR_SYNC_TIMEOUT = 4, ERROR_DATA_TIMEOUT =5, ERROR_CHECKSUM = 6, ERROR_NO_PATIENCE =7 }
enum	eScale { CELCIUS =0, FARENHEIT =1, KELVIN =2 }

Public Functions

Type	Name
	DHT (PinName pin, int DHTtype)
	~DHT ()
int	readData (void)
float	ReadHumidity (void)
float	ReadTemperature (eScale Scale)
float	CalcdewPoint (float celsius, float humidity)
float	CalcdewPointFast (float celsius, float humidity)

Public Types Documentation

enum eError

enum DHT::eError {
    DHT11 = 11,
    SEN11301P = 11,
    RHT01 = 11,
    DHT22 = 22,
    AM2302 = 22,
    SEN51035P = 22,
    RHT02 = 22,
    RHT03 = 22,
    ERROR_NONE = 0,
    BUS_BUSY =1,
    ERROR_NOT_PRESENT =2,
    ERROR_ACK_TOO_LONG =3,
    ERROR_SYNC_TIMEOUT = 4,
    ERROR_DATA_TIMEOUT =5,
    ERROR_CHECKSUM = 6,
    ERROR_NO_PATIENCE =7,
};

enum eError

enum DHT::eError {
    DHT11 = 11,
    SEN11301P = 11,
    RHT01 = 11,
    DHT22 = 22,
    AM2302 = 22,
    SEN51035P = 22,
    RHT02 = 22,
    RHT03 = 22,
    ERROR_NONE = 0,
    BUS_BUSY =1,
    ERROR_NOT_PRESENT =2,
    ERROR_ACK_TOO_LONG =3,
    ERROR_SYNC_TIMEOUT = 4,
    ERROR_DATA_TIMEOUT =5,
    ERROR_CHECKSUM = 6,
    ERROR_NO_PATIENCE =7,
};

enum eScale

enum DHT::eScale {
    CELCIUS =0,
    FARENHEIT =1,
    KELVIN =2,
};

Public Functions Documentation

function DHT

DHT::DHT (
    PinName pin,
    int DHTtype
)

DHT constructor

Parameters:

• pin data pin of sensor

• DHTtype type of sensor

function ~DHT

DHT::~DHT ()

function readData

int DHT::readData (
    void 
)

read the data from sensor

Returns:

eError or 0 in case of no error

function ReadHumidity

float DHT::ReadHumidity (
    void 
)

read last humidity, readData has to be called to update the value

Returns:

humidity in %

function ReadTemperature

float DHT::ReadTemperature (
    eScale Scale
)

read last temperature, readData has to be called to update the value

Parameters:

• Scale select the scale (CELCIUS, FARENHEIT or KELVIN)

Returns:

temperature in selected scale

function CalcdewPoint

float DHT::CalcdewPoint (
    float celsius,
    float humidity
)

function CalcdewPointFast

float DHT::CalcdewPointFast (
    float celsius,
    float humidity
)

The documentation for this class was generated from the following file: D:/w/hw-libs/\_libs\_/libraries/DHT.h