#include "DHT.h"  //导入DHT.H库文件
#define DHTPIN 2     // DHT信号引脚插在uno主板2号引脚

#define DHTTYPE DHT11   // 声明DHT传感器规格为DHT11(DHT22)

DHT dht(DHTPIN, DHTTYPE);//DHT传感器说明

void setup() {
  Serial.begin(9600);
  Serial.println(F("DHTxx test!"));
  dht.begin();  //启动传感器
}

void loop() {
  delay(2000); //等待2秒，DHT传感器首次传输数据要250毫秒-2秒

  float h = dht.readHumidity(); //读取湿度值
  float t = dht.readTemperature(); //读取温度为摄氏度值
  float f = dht.readTemperature(true);//读取温度为华氏度

  if (isnan(h) || isnan(t) || isnan(f)) {  //检查是否有任何读取失败，并提前退出（重试）。
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }
  float hif = dht.computeHeatIndex(f, h);  //以华氏度为单位计算热指数
  float hic = dht.computeHeatIndex(t, h, false);//以摄氏度为单位计算热指数（isFahreheit=false）

  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.print(F("°C "));
  Serial.print(f);
  Serial.print(F("°F  Heat index: "));
  Serial.print(hic);
  Serial.print(F("°C "));
  Serial.print(hif);
  Serial.println(F("°F"));
}