溫濕度傳感器DH11
#include <dht11.h> //參考dht11庫檔案，使得下面可以呼叫相關引數
dht11 DHT11; //實體化一個物件
#define DHT11PIN 2 //定義溫濕度針腳號為2號引腳
void setup()
{
Serial.begin(9600);
Serial.println("DHT11 TEST PROGRAM ");
Serial.print("LIBRARY VERSION: ");
Serial.println(DHT11LIB_VERSION);
Serial.println();
}
void loop()
{
Serial.println("\n");
int chk = DHT11.read(DHT11PIN); //將讀取到的值賦給chk
Serial.print("Read sensor: ");
switch (chk)
{
case DHTLIB_OK:
Serial.println("OK");
break;
case DHTLIB_ERROR_CHECKSUM:
Serial.println("Checksum error");
break;
case DHTLIB_ERROR_TIMEOUT:
Serial.println("Time out error");
break;
default:
Serial.println("Unknown error");
break;
}
Serial.print("Humidity (%): ");
Serial.println((float)DHT11.humidity, 2);
Serial.print("Temperature (oC): ");
Serial.println((float)DHT11.temperature, 2);
Serial.print("Temperature (oF): ");
Serial.println(Fahrenheit(DHT11.temperature), 2);
Serial.print("Temperature (K): ");
Serial.println(Kelvin(DHT11.temperature), 2);
Serial.print("Dew Point (oC): ");
Serial.println(dewPoint(DHT11.temperature, DHT11.humidity));
Serial.print("Dew PointFast (oC): ");
Serial.println(dewPointFast(DHT11.temperature, DHT11.humidity));
delay(2000);
}
double Fahrenheit(double celsius)
{
return 1.8 * celsius + 32;
} //攝氏溫度度轉化為華氏溫度
double Kelvin(double celsius)
{
return celsius + 273.15;
} //攝氏溫度轉化為開氏溫度
// 露點（點在此溫度時，空氣飽和并產生露珠）
// 參考: http://wahiduddin.net/calc/density_algorithms.htm
double dewPoint(double celsius, double humidity)
{
double A0= 373.15/(273.15 + celsius);
double SUM = -7.90298 * (A0-1);
SUM += 5.02808 * log10(A0);
SUM += -1.3816e-7 * (pow(10, (11.344*(1-1/A0)))-1) ;
SUM += 8.1328e-3 * (pow(10,(-3.49149*(A0-1)))-1) ;
SUM += log10(1013.246);
double VP = pow(10, SUM-3) * humidity;
double T = log(VP/0.61078); // temp var
return (241.88 * T) / (17.558-T);
}
// 快速計算露點，速度是5倍dewPoint()// 參考: http://en.wikipedia.org/wiki/Dew_pointdouble dewPointFast(double celsius, double humidity){double a = 17.271;double b = 237.7;double temp = (a * celsius) / (b + celsius) + log(humidity/100);double Td = (b * temp) / (a - temp);return Td;}
運行效果:
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