Arduino Leonardo读取DHT22温湿度传感器

首先在该地址下载库：https://codeload.github.com/nethoncho/Arduino-DHT22/zip/master

使用以下代码测试：

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

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();
}