#include "DHT.h"
#define DHTPIN 4
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  dht.begin();
}

void loop() {
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  if(isnan(h) || isnan(t)){
    Serial.println("读取失败");
  }else{
    Serial.print("湿度：");Serial.print(h,1);
    Serial.print(" 温度：");Serial.println(t,1);
  }
  delay(2000);
}