#include <DHT.h>

#define DHTPIN 4
#define DHTTYPE DHT22
#define LED_PIN 2
#define BUTTON_PIN 0

DHT dht(DHTPIN, DHTTYPE);
bool alertState = false;

void setup() {
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  Serial.begin(115200);
  dht.begin();
}

void loop() {
  delay(2000);

  float temperature = dht.readTemperature();
  if (isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  if (temperature > 30) {  
    alertState = true;
  }

  if (alertState) {
    digitalWrite(LED_PIN, HIGH);
    Serial.println("Temperature alert: LED ON");
  } else {
    digitalWrite(LED_PIN, LOW);
    Serial.println("Temperature normal: LED OFF");
  }

  if (digitalRead(BUTTON_PIN) == LOW) {
    alertState = false;
    digitalWrite(LED_PIN, LOW);
    Serial.println("Alert reset: LED OFF");
    delay(200); 
  }
}