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(115200);
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, 1);
Serial.print(",\t");
Serial.println(DHT.temperature, 1);

delay(1000);
}