#include <DHT.h>
const int dhtPin = 14;
DHT dht(dhtPin, DHT22);
byte led_pin = 21;
byte buzzer = 17;
unsigned long currentMillis = 0;
unsigned long previousMillis = 0;
void setup() {
  Serial.begin(115200);
  Serial.println("Hello,ESP32");
  dht.begin();
  pinMode(led_pin, OUTPUT);
  pinMode(buzzer, OUTPUT);
}
void loop() {

  currentMillis = millis();
  if (currentMillis - previousMillis >= 2000)
  {

    float humidity = dht.readHumidity();
    if (humidity > 50)
    {
      digitalWrite(buzzer, HIGH);
      Serial.println("buzzer on");

    }
    else {
      digitalWrite(buzzer, LOW);
      Serial.println("buzzer off");
    }

    float temperature = dht.readTemperature();
    if (temperature < 30)
    {
      digitalWrite(led_pin, HIGH);
      Serial.println("led on");
    }
    else {
      digitalWrite(led_pin, LOW);
      Serial.println("led off");
    }
    previousMillis = currentMillis;
  }
}