Temperature and humidity sensor DHT11

If you want to use the Arduino Development Board drive DHT11 to obtain temperature and humidity, it is recommended to use a third-party library, which can speed up the development of the program, and is not prone to error, the following code I have been transferred to the third-party library. For detailed installation methods, please refer to the Geek Pioneer's blog: The http://www.cnblogs.com/jikexianfeng/p/6290203.html author installs the minimum version (1.0.0). This is for better compatibility.

1 /*********************************2 code function: Temperature and humidity sensor DHT113 using functions:4 Simple_dht11_read (DHT11 sensor pin, storing humidity data address, storing temperature data address, storing 40-bit 01 data address); Obtaining temperature and humidity data functions5 using header files:6 #include <SimpleDHT.h>//need to install the library, specific installation methods see:http://www.cnblogs.com/jikexianfeng/p/6290203.html7 creation time: 2017*1*188 Author Email: [Email protected]9 ********************************/Ten#include <SimpleDHT.h> One intPinDHT11 =2; A  - voidSetup () - { theSerial.begin (115200); - } -  - voidLoop () + { -Serial.println ("================================="); +Serial.println ("Sample DHT11 ..."); A   byteTemperatyre =0;//Temperature at   byteHumidity =0;//Humidity -   bytedata[ +]; -   if(Simple_dht11_read (PinDHT11, &temperatyre, &humidity, data)) { -Serial.print ("Read DHT11 failed."); -     return; -   } inSerial.print ("Humidity (%):"); - serial.println (humidity); toSerial.print ("Temperatyre (OC)"); + serial.println (Temperatyre); -Serial.print ("Temperatyre (OF)"); the serial.println (Fahrenheit (Temperatyre)); *Serial.print ("Temperatyre (k)"); $ serial.println (Kelvin (Temperatyre));Panax NotoginsengSerial.print ("Dew Point (OC):"); - serial.println (Dewpoint (temperatyre,humidity)); the   //serial.print ("Dew pointfast (OC):"); +   //serial.println (Dewpointfast (temperatyre,humidity)); ADelay +); the } +  - DoubleFahrenheit (byteCelsius) $ { $   return 1.8*celsius+ +; - } -  the DoubleKelvin (byteCelsius) - {Wuyi   returncelsius+273.15; the } -  Wu DoubleDewpoint (byteCelsiusbytehumidity) - { About   DoubleA0 =373.15/(273.15+Celsius); $   DoubleSUM =-7.90298* (a0-1); -sum+=5.02808*log10 (A0); -sum+=-1.3816e-78* (POW (Ten,(11.344*(1-1/A0))-1); -sum+=8.1328e-3* (POW (Ten,(-3.49149* (a0-1)))-1); ASUM+=LOG10 (1013.246); +   DoubleVp=pow (Ten, sum-3)*humidity; the   DoubleT =log (vp/0.61078); -   return(241.88*T)/(17.558-T); $ } the  the DoubleDewpointfast (byteCelsiusbytehumidity) the { the   DoubleA=17.271; -   Doubleb=273.7; in   Doubletemp= (A*celsius)/(B+celsius) +log (humidity/ -); the   DoubleTd= (b*temp)/(A-temp); the   returnTd; About}

If the collected data does not have floating point data, so the floating-point character data is all 0, this is the problem of the sensor, can not be performed when the code is the question.

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Reference page: http://www.cnblogs.com/jikexianfeng/p/6290203.html

Reference page: Http://wenku.baidu.com/view/dcdc9efa700abb68a982fbe0.html?re=view

Temperature and humidity sensor DHT11