DHT11 arduino代碼實例

ID:206117 · 發表于 2017-5-30 17:48

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）

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()

double 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;
}

#include <dht11.h>

dht11 DHT11;

#define DHT11PIN 4

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);

  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);
}

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DHT11 arduino代碼實例