Arduino-DHT11库，每30秒读取一次

Question

does any one here experienced with various dht11 library for arduino?, I want to read the temperature value every 30 second, I am using the standard library but sometimes throw me NaN. In avarege I got 2 NaN values out of 10 readings (20%).

Answer 1

I got many errors about many dht11 libraries, but one day finally I found a good library and good example code.

Firstly you have to download the library from this link and add this to arduino's library folder.

Secondly, you should do this pin connections

Lastly, here it is example code. It should work.

#include <dht11.h>

int DHT11_pin=2;
dht11 DHT11_sensor;

void setup()
{
  Serial.begin(9600);
  Serial.println("GOOD LUCK");
  Serial.println("*********************");
}

void loop()
{
  int chk = DHT11_sensor.read(DHT11_pin);

  Serial.print("Humidity (%): ");
  Serial.println((float)DHT11_sensor.humidity, 2);

  Serial.print("Temp (Celcius): ");
  Serial.println((float)DHT11_sensor.temperature);

  Serial.print("Temp (Kelvin): ");
  Serial.println(DHT11_sensor.kelvin(), 2);

  Serial.print("Temp (Fahrenheit): ");
  Serial.println(DHT11_sensor.fahrenheit(), 2);

  Serial.print("Dew Point: ");
  Serial.println(DHT11_sensor.dewPoint(), 2);

  Serial.println("------------------");
  delay(500);

}