/*?DHT?library

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

#include?“DHT.h“

#define?MIN_INTERVAL?2000

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
	//?basd?on?the?speed?of?the?processor.
}

void?DHT::begin（void）?
{
	//?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?=?-MIN_INTERVAL;
	DEBUG_PRINT（“Max?clock?cycles:?“）;?
	DEBUG_PRINTLN（_maxcycles?DEC）;
}

//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（S）?
			{
				f?=?convertCtoF（f）;
			}
			break;
			case?DHT22:
			case?DHT21:
			f?=?data[2]?&?0x7F;
			f?*=?256;
			f?+=?data[3];
			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（））?
	{
		switch?（_type）?
		{
			case?DHT11:
			f?=?data[0];
			break;
			case?DHT22:
			case?DHT21:
			f?=?data[0];
			f?*=?256;
			f?+=?data[1];
			f?*=?0.1;
			break;
		}
	}
	return?f;
}

//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）?*?1.2）?+?（percentHumidity?*?0.094））;

	if?（hi?>?79）?
	{
		hi?=?-42.379?+
		2.04901523?*?temperature?+
		10.14333127?*?percentHumidity?+
		-0.22475541?*?temperature*percentHumidity?+
		-0.00683783?*?pow（temperature?2）?+
		-0.05481717?*?pow（percentHumidity?2）?+
		0.00122874?*?pow（temperature?2）?*?percentHumidity?+
		0.00085282?*?temperature*pow（percentHumidity?2）?+
		-0.00000199?*?pow（temperature?2）?*?pow（percentHumidity?2）;

		if（（percentHumidity?=?80.0）?&&?（temperature?<=?112.0））
		hi?-=?（（13.0?-?percentHumidity）?*?0.25）?*?sqrt（（17.0?-?abs（temperature?-?95.0））?*?0.05882）;

		else?if（（percentHumidity?>?85.0）?&&?（temperature?>=?80.0）?&&?（temperature?<=?87.0））
		hi?+=?（（percentHumidity?-?85.0）?*?0.1）?*?（（87.0?-?temperature）?*?0.2）;
	}

	return?isFahrenheit???hi?:?convertFtoC（hi）;
}

boolean?DHT::read（bool?force）?
{
	//?Check?if?sens

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-01-24?09:19??DHT_sensor_library\
?????文件????????8087??2018-01-24?20:33??DHT_sensor_library\DHT.cpp
?????文件????????1531??2018-01-24?21:04??DHT_sensor_library\DHT.h
?????文件????????5740??1980-01-01?00:00??DHT_sensor_library\DHT_U.cpp
?????文件????????2297??1980-01-01?00:00??DHT_sensor_library\DHT_U.h
?????目錄???????????0??2018-01-24?09:19??DHT_sensor_library\examples\
?????目錄???????????0??2018-01-24?09:19??DHT_sensor_library\examples\DHT_Unified_Sensor\
?????文件????????3174??1980-01-01?00:00??DHT_sensor_library\examples\DHT_Unified_Sensor\DHT_Unified_Sensor.ino
?????目錄???????????0??2018-01-24?09:19??DHT_sensor_library\examples\DHTtester\
?????文件????????2219??1980-01-01?00:00??DHT_sensor_library\examples\DHTtester\DHTtester.ino
?????文件?????????529??1980-01-01?00:00??DHT_sensor_library\keywords.txt
?????文件?????????321??1980-01-01?00:00??DHT_sensor_library\library.properties
?????文件?????????957??1980-01-01?00:00??DHT_sensor_library\README.md