arduinoDHT11温湿度传感器程序

ti

将温度计和湿度计合二为一的传感器DHT11
vcc接口5v
GND接地
data接口2
NC没用
程序：
/*YourDuino.com Example Software Sketch
DHT11 Humidity and Temperature Sensor test
Credits:Rob tillaart
http://arduino-direct.com/sunshop/index.ph?l=product_detail&p=162
terry@yourduino.com*/
#include
dht11 DHT11;
#define DHT11PIN 2
void setup() {
  Serial.begin(9600);
}
void loop() {
  Serial.println("n");
  int chk = DHT11.read(DHT11PIN);
  Serial.print("Read sennor:");
  switch(chk)
  {
case 0:
         Serial.println("OK");
case -1:
         Serial.println("Checksum error");
case -2:
         Serial.println("Time out error");
default:
         Serial.println("Unknown error");
         break;

  }
  Serial.print("Humigity (%) : ");
  Serial.println((float)DHT11.humiditay,2);
  Serial.print("Temperature (oC) : ");
  Serial.println((float)DHT11.temperature,2);
  Serial.print("Temperature (oF) : ");
  Serial.println(Fahrenheit(DHT11.humiditay),2);
  Serial.print("Temperature (K) : ");
  Serial.println(Kelvin(DHT11.temperature),2);
  Serial.print("Dew Point (oC) : ");
  Serial.println((float)DHT11.humiditay,2);
  Serial.print("Dew PointFast (oC) : ");
  Serial.println(dewPointFast(DHT11.temperature,DHT11.humidity));
  delay(1000);

}
double Fahrenheit(double celsius){
  return 1.8*celsius+32;
}
double Kelvin(double celsius){
  return celsius+273.15;
}
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+=8.13283-3*(pow(10,(-3.49149*(A0-1)))-1);
  SUM+=log10(1013.246);
  double VP=pow(10,SUM-3)*humidity;
  double T=log(VP/0.61078);
  return(241.88*T)/(17.558-T);
}
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;
}
打开串口监视器就会看到数据。

呵呵笨小孩007 · 2016-12-2 17:09:56

非常有用，学习了

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arduinoDHT11温湿度传感器程序

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