#include <DHT.h>

#define DHT_PIN PA1
#define DHT_TYPE DHT22

#define BUZZER_PIN PA5

DHT dht(DHT_PIN, DHT_TYPE);

void setup()
{
  Serial.begin(115200);

  pinMode(BUZZER_PIN, OUTPUT);
  digitalWrite(BUZZER_PIN, LOW);

  dht.begin();

  Serial.println("DHT22 Sensor Starting...");
}

void loop()
{
  delay(2000);

  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  // Check whether DHT22 reading is valid
  if (isnan(humidity) || isnan(temperature))
  {
    Serial.println("Failed to read DHT22!");

    digitalWrite(BUZZER_PIN, HIGH);
    return;
  }

  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C");

  Serial.print("    Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

  // Alarm condition
  if (temperature >= 32.0 || humidity >= 80.0)
  {
    digitalWrite(BUZZER_PIN, HIGH);
    Serial.println("WARNING! Buzzer ON");
  }
  else
  {
    digitalWrite(BUZZER_PIN, LOW);
    Serial.println("Normal - Buzzer OFF");
  }
}