/*?DHT?library

MIT?license
written?by?Adafruit?Industries
*/

#include?“DHT.h“

#define?MIN_INTERVAL?2000
#define?TIMEOUT?-1

DHT::DHT（uint8_t?pin?uint8_t?type?uint8_t?count）?{
??_pin?=?pin;
??_type?=?type;
??#ifdef?__AVR
????_bit?=?digitalPinToBitMask（pin）;
????_port?=?digitalPinToPort（pin）;
??#endif
??_maxcycles?=?microsecondsToClockCycles（1000）;??//?1?millisecond?timeout?for
?????????????????????????????????????????????????//?reading?pulses?from?DHT?sensor.
??//?Note?that?count?is?now?ignored?as?the?DHT?reading?algorithm?adjusts?itself
??//?based?on?the?speed?of?the?processor.
}

//?Optionally?pass?pull-up?time?（in?microseconds）?before?DHT?reading?starts.
//?Default?is?55?（see?function?declaration?in?DHT.h）.
void?DHT::begin（uint8_t?usec）?{
??//?set?up?the?pins!
??pinMode（_pin?INPUT_PULLUP）;
??//?Using?this?value?makes?sure?that?millis（）?-?lastreadtime?will?be
??//?>=?MIN_INTERVAL?right?away.?Note?that?this?assignment?wraps?around
??//?but?so?will?the?subtraction.
??_lastreadtime?=?millis（）?-?MIN_INTERVAL;
??DEBUG_PRINT（“DHT?max?clock?cycles:?“）;?DEBUG_PRINTLN（_maxcycles?DEC）;
??pullTime?=?usec;
}

//boolean?S?==?Scale.??True?==?Fahrenheit;?False?==?Celcius
float?DHT::readTemperature（bool?S?bool?force）?{
??float?f?=?NAN;

??if?（read（force））?{
????switch?（_type）?{
????case?DHT11:
??????f?=?data[2];
??????if?（data[3]?&?0x80）?{
????????f?=?-1?-?f?;
??????}
??????f?+=?（data[3]?&?0x0f）?*?0.1;
??????if（S）?{
????????f?=?convertCtoF（f）;
??????}
??????break;
????case?DHT12:
??????f?=?data[2];
??????f?+=?（data[3]?&?0x0f）?*?0.1;
??????if?（data[2]?&?0x80）?{
????????f?*=?-1;
??????}
??????if（S）?{
????????f?=?convertCtoF（f）;
??????}
??????break;
????case?DHT22:
????case?DHT21:
??????f?=?（（word）（data[2]?&?0x7F））?<??????f?*=?0.1;
??????if?（data[2]?&?0x80）?{
????????f?*=?-1;
??????}
??????if（S）?{
????????f?=?convertCtoF（f）;
??????}
??????break;
????}
??}
??return?f;
}

float?DHT::convertCtoF（float?c）?{
??return?c?*?1.8?+?32;
}

float?DHT::convertFtoC（float?f）?{
??return?（f?-?32）?*?0.55555;
}

float?DHT::readHumidity（bool?force）?{
??float?f?=?NAN;
??if?（read（force））?{
????switch?（_type）?{
????case?DHT11:
????case?DHT12:
??????f?=?data[0]?+?data[1]?*?0.1;
??????break;
????case?DHT22:
????case?DHT21:
??????f?=?（（word）data[0]）?<??????f?*=?0.1;
??????break;
????}
??}
??return?f;
}

//boolean?isFahrenheit:?True?==?Fahrenheit;?False?==?Celcius
float?DHT::computeHeatIndex（bool?isFahrenheit）?{
??float?hi?=?computeHeatIndex（readTemperature（isFahrenheit）?readHumidity（）
????isFahrenheit）;
??return?isFahrenheit???hi?:?convertFtoC（hi）;
}

//boolean?isFahrenheit:?True?==?Fahrenheit;?False?==?Celcius
float?DHT::computeHeatIndex（float?temperature?float?percentHumidity
??bool?isFahrenheit）?{
??//?Using?both?Rothfusz?and?Steadman‘s?equations
??//?http://www.wpc.ncep.noaa.gov/html/heatindex_equation.shtml
??float?hi;

??if?（!isFahrenheit）
????temperature?=?convertCtoF（temperature）;

??hi?=?0.5?*?（temperature?+?61.0?+?（（temperature?-?68.0）?*

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2019-02-18?18:20??DHT-sensor-library-master\
?????目錄???????????0??2019-02-18?18:20??DHT-sensor-library-master\.github\
?????文件????????2624??2019-02-18?18:20??DHT-sensor-library-master\.github\ISSUE_TEMPLATE.md
?????文件????????1415??2019-02-18?18:20??DHT-sensor-library-master\.github\PULL_REQUEST_TEMPLATE.md
?????文件????????9749??2019-02-18?18:20??DHT-sensor-library-master\DHT.cpp
?????文件????????1804??2019-02-18?18:20??DHT-sensor-library-master\DHT.h
?????文件????????6196??2019-02-18?18:20??DHT-sensor-library-master\DHT_U.cpp
?????文件????????2297??2019-02-18?18:20??DHT-sensor-library-master\DHT_U.h
?????文件?????????942??2019-02-18?18:20??DHT-sensor-library-master\README.md
?????目錄???????????0??2019-02-18?18:20??DHT-sensor-library-master\examples\
?????目錄???????????0??2019-02-18?18:20??DHT-sensor-library-master\examples\DHT_Unified_Sensor\
?????文件????????3294??2019-02-18?18:20??DHT-sensor-library-master\examples\DHT_Unified_Sensor\DHT_Unified_Sensor.ino
?????目錄???????????0??2019-02-18?18:20??DHT-sensor-library-master\examples\DHTtester\
?????文件????????2539??2019-02-18?18:20??DHT-sensor-library-master\examples\DHTtester\DHTtester.ino
?????文件?????????529??2019-02-18?18:20??DHT-sensor-library-master\keywords.txt
?????文件?????????321??2019-02-18?18:20??DHT-sensor-library-master\library.properties