DHT22 Temperature / Humidity sensor

Avr::Dht22 decodes data from DHT22 / AM2302 Temperature and Humidity sensors. More...

Collaboration diagram for DHT22 Temperature / Humidity sensor:

Files
file	dht22.h
	Avr::Dht22 decodes data from DHT22 / AM2302 Temperature and Humidity sensors.

Classes
class	Avr::Dht22< TPin >
	Decodes data from DHT22 / AM2302 Temperature and humidity sensors. More...

Detailed Description

Avr::Dht22 decodes data from DHT22 / AM2302 Temperature and Humidity sensors.

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Class Documentation

Avr::Dht22

class Avr::Dht22

template<typename TPin>
class Avr::Dht22< TPin >

Decodes data from DHT22 / AM2302 Temperature and humidity sensors.

Template Parameters

TPin	The Avr::InputOutputPin used to connect the sensor.

See also

http://akizukidenshi.com/download/ds/aosong/AM2302.pdf

Public Member Functions
bool	isValid () const
	Determines if the last sensor access was valid. More...
float	temperature () const
	Retrieves the cached temperature value. More...
float	humidity () const
	Retrieves the cached humidity value. More...
bool	read ()
	Reads the temperature and humidity from the sensor and updates the cached values. More...

Member Function Documentation

isValid()

template<typename TPin >

bool Avr::Dht22< TPin >::isValid ( ) const

inline

Determines if the last sensor access was valid.

Returns

true if the last sensor access was valid and temperature and humidity can be read, false if an error occurred on the last sensor access.

temperature()

template<typename TPin >

float Avr::Dht22< TPin >::temperature ( ) const

inline

Retrieves the cached temperature value.

The temperature value is updated by read.

Returns

The cached temperature value.

humidity()

template<typename TPin >

float Avr::Dht22< TPin >::humidity ( ) const

inline

Retrieves the cached humidity value.

The humidity value is updated by read.

Returns

The cached humidity value.

read()

template<typename TPin >

bool Avr::Dht22< TPin >::read ( )

inline

Reads the temperature and humidity from the sensor and updates the cached values.

Returns

true if the sensor data could be read, false if an error occurred when accessing the sensor.