/*******************************************************

这个程序用来测试DHT22的温湿度。

********************************************************/

#include <dht.h>

dht DHT;

#define DHT22_PIN 7

void setup()

{

  Serial.begin();

  Serial.println("DHT TEST PROGRAM ");

  Serial.print("LIBRARY VERSION: ");

  Serial.println(DHT_LIB_VERSION);

  Serial.println();

  Serial.println("Type,\tstatus,\tHumidity (%),\tTemperature (C)");

}

void loop()

{

  Serial.print("DHT22, \t");

  int chk = DHT.read22(DHT22_PIN);  //读取数据

  switch (chk)

  {

    case DHTLIB_OK:

                Serial.print("OK,\t");

                break;

    case DHTLIB_ERROR_CHECKSUM:

                Serial.print("Checksum error,\t");

                break;

    case DHTLIB_ERROR_TIMEOUT:

                Serial.print("Time out error,\t");

                break;

    default:

                Serial.print("Unknown error,\t");

                break;

  }

  // 显示数据

  Serial.print(DHT.humidity, );

  Serial.print(",\t");

  Serial.println(DHT.temperature, );

  delay();

}