DHT Class Reference

Class that stores state and functions for DHT. More...

#include <DHT.h>

Public Member Functions
	DHT (uint8_t pin, uint8_t type, uint8_t count=6)
	Instantiates a new DHT class. More...
void	begin (uint8_t usec=55)
	Setup sensor pins and set pull timings. More...
float	readTemperature (bool S=false, bool force=false)
	Read temperature. More...
float	convertCtoF (float)
	Converts Celcius to Fahrenheit. More...
float	convertFtoC (float)
	Converts Fahrenheit to Celcius. More...
float	computeHeatIndex (bool isFahrenheit=true)
	Compute Heat Index Simplified version that reads temp and humidity from sensor. More...
float	computeHeatIndex (float temperature, float percentHumidity, bool isFahrenheit=true)
	Compute Heat Index Using both Rothfusz and Steadman's equations (http://www.wpc.ncep.noaa.gov/html/heatindex_equation.shtml) More...
float	readHumidity (bool force=false)
	Read Humidity. More...
bool	read (bool force=false)
	Read value from sensor or return last one from less than two seconds. More...

Detailed Description

Class that stores state and functions for DHT.

Constructor & Destructor Documentation

DHT()

DHT::DHT	(	uint8_t	pin,
		uint8_t	type,
		uint8_t	count = 6
	)

Instantiates a new DHT class.

Parameters

pin	pin number that sensor is connected
type	type of sensor
count	number of sensors

Member Function Documentation

begin()

void DHT::begin

(

uint8_t

usec = 55

)

Setup sensor pins and set pull timings.

Parameters

usec	Optionally pass pull-up time (in microseconds) before DHT reading starts. Default is 55 (see function declaration in DHT.h).

readTemperature()

float DHT::readTemperature	(	bool	S = false,
		bool	force = false
	)

Read temperature.

Parameters

S	Scale. Boolean value: true = Fahrenheit false = Celcius
force	true if in force mode

Returns

Temperature value in selected scale

convertCtoF()

float DHT::convertCtoF

(

float

c

)

Converts Celcius to Fahrenheit.

Parameters

c	value in Celcius

Returns

float value in Fahrenheit

convertFtoC()

float DHT::convertFtoC

(

float

f

)

Converts Fahrenheit to Celcius.

Parameters

f	value in Fahrenheit

Returns

float value in Celcius

computeHeatIndex() [1/2]

float DHT::computeHeatIndex

(

bool

isFahrenheit = true

)

Compute Heat Index Simplified version that reads temp and humidity from sensor.

Parameters

isFahrenheit

true if fahrenheit, false if celcius (default true)

Returns

float heat index

computeHeatIndex() [2/2]

float DHT::computeHeatIndex	(	float	temperature,
		float	percentHumidity,
		bool	isFahrenheit = true
	)

Compute Heat Index Using both Rothfusz and Steadman's equations (http://www.wpc.ncep.noaa.gov/html/heatindex_equation.shtml)

Parameters

temperature	temperature in selected scale
percentHumidity	humidity in percent
isFahrenheit	true if fahrenheit, false if celcius

Returns

float heat index

readHumidity()

float DHT::readHumidity

(

bool

force = false

)

Read Humidity.

Parameters

force

force read mode

Returns

float value - humidity in percent

read()

bool DHT::read

(

bool

force = false

)

Read value from sensor or return last one from less than two seconds.

Parameters

force

true if using force mode

Returns

float value

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

• DHT.h
• DHT.cpp