#include "DHT.h"
#define DHTPIN 2 
#define DHTTYPE DHT22
#define pin_led1 4
#define pin_led2 3
#define pin_led3 5
#define pin_led4 6
#define pin_feng 8

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  Serial.println(F("DHTxx test!"));
  dht.begin();
  pinMode(pin_led1, OUTPUT);
  pinMode(pin_led2, OUTPUT);
  pinMode(pin_feng, OUTPUT);
  pinMode(pin_led3, OUTPUT);
  pinMode(pin_led4, OUTPUT);


}

void loop() {
  
  delay(2000);

  float h = dht.readHumidity();
  float t = dht.readTemperature();
  float f = dht.readTemperature(true);

  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }
  float hif = dht.computeHeatIndex(f, h);
  float hic = dht.computeHeatIndex(t, h, false);
  Serial.print(F("湿度: "));
  Serial.print(h);
  Serial.print(F("%  温度: "));
  Serial.print(t);
  Serial.print(F("°C "));
  Serial.print(f);
  Serial.print(F("°F  热指数: "));
  Serial.print(hic);
  Serial.print(F("°C "));
  Serial.print(hif);
  Serial.println(F("°F"));
  if(h<30){digitalWrite(pin_led1, 1);}
  else if(h>90){digitalWrite(pin_led3, 1);}
  if(t>23){digitalWrite(pin_led2, 1);}
  else if(t<18){digitalWrite(pin_led4, 1);}
  if(h<30 or t>23 or h>90 or t<18){tone(8, 262);}

}