DHT< DATA_PIN, DEVICE > Class Template Reference

#include <DHT.h>

Inheritance diagram for DHT< DATA_PIN, DEVICE >:

Collaboration diagram for DHT< DATA_PIN, DEVICE >:

Public Member Functions
	DHT ()
float	humidity ()
float	temperature ()
int	read (float &humidity, float &temperature)

Protected Attributes
GPIO< DATA_PIN >	m_data
float	m_humidity
float	m_temperature

Static Protected Attributes
static const uint16_t	START_SIGNAL = 18
static const uint16_t	PULLUP = 4
static const int	THRESHOLD = 60

Detailed Description

template<BOARD::pin_t DATA_PIN, uint8_t DEVICE>
class DHT< DATA_PIN, DEVICE >

DHT Humidity & Temperature Sensor device driver template class.

Parameters

[in]	DATA_PIN	board pin for data signal.
[in]	DEVICE	type number (11, 21 or 22).

Circuit

                          DHTXX
                      +------------+
(VCC)---------------1-|VCC  ====== |
(DATA_PIN)----------2-|DATA ====== |
                    3-|     ====== |
(GND)---------------4-|GND  ====== |
                      +------------+

Connect DHT to data pin, VCC and ground. A pullup resistor from the pin to VCC should be used. Most DHT modules have a built-in pullup resistor.

Definition at line 43 of file DHT.h.

Constructor & Destructor Documentation

template<BOARD::pin_t DATA_PIN, uint8_t DEVICE>

DHT< DATA_PIN, DEVICE >::DHT ( )

inline

Initiate device communication pin.

Definition at line 48 of file DHT.h.

Member Function Documentation

template<BOARD::pin_t DATA_PIN, uint8_t DEVICE>

float DHT< DATA_PIN, DEVICE >::humidity ( )

inline

Return latest humidity reading.

Returns

humidity.

Definition at line 59 of file DHT.h.

template<BOARD::pin_t DATA_PIN, uint8_t DEVICE>

int DHT< DATA_PIN, DEVICE >::read ( float &  humidity, float &  temperature  )

inline

Read humidity and temperature from device. Returns number of changed values (0-2) otherwise negative error code (-1: check sum error, -2: response pulse error)

Definition at line 78 of file DHT.h.

template<BOARD::pin_t DATA_PIN, uint8_t DEVICE>

float DHT< DATA_PIN, DEVICE >::temperature ( )

inline

Return latest temperature reading.

Returns

temperature.

Definition at line 68 of file DHT.h.

Member Data Documentation

template<BOARD::pin_t DATA_PIN, uint8_t DEVICE>

GPIO<DATA_PIN> DHT< DATA_PIN, DEVICE >::m_data

protected

Board pin for data communication.

Definition at line 140 of file DHT.h.

template<BOARD::pin_t DATA_PIN, uint8_t DEVICE>

float DHT< DATA_PIN, DEVICE >::m_humidity

protected

Latest humidity reading.

Definition at line 143 of file DHT.h.

template<BOARD::pin_t DATA_PIN, uint8_t DEVICE>

float DHT< DATA_PIN, DEVICE >::m_temperature

protected

Latest temperature reading.

Definition at line 146 of file DHT.h.

template<BOARD::pin_t DATA_PIN, uint8_t DEVICE>

const uint16_t DHT< DATA_PIN, DEVICE >::PULLUP = 4

staticprotected

Pullup delay in microseconds.

Definition at line 134 of file DHT.h.

template<BOARD::pin_t DATA_PIN, uint8_t DEVICE>

const uint16_t DHT< DATA_PIN, DEVICE >::START_SIGNAL = 18

staticprotected

Start signal pulse width in milliseconds.

Definition at line 131 of file DHT.h.

template<BOARD::pin_t DATA_PIN, uint8_t DEVICE>

const int DHT< DATA_PIN, DEVICE >::THRESHOLD = 60

staticprotected

Pulse threshold in microseconds.

Definition at line 137 of file DHT.h.

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

• src/DHT.h