#include <DHT.h>

#define DHTPIN 4
#define DHTTYPE DHT22
#define FAN_PIN 2 //Thay bẳng led
#define BUTTON_PIN 0

float tempThreshold = 30.0; 
bool buttonPressedLast = false;

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  pinMode(FAN_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 > tempThreshold) {
    digitalWrite(FAN_PIN, HIGH);
    Serial.print("Fan is ON. Temperature: ");
  } else {
    digitalWrite(FAN_PIN, LOW);
    Serial.print("Fan is OFF. Temperature: ");
  }
  
  Serial.println(temperature);

  bool buttonPressedCurrent = (digitalRead(BUTTON_PIN) == LOW);
  
  if (buttonPressedCurrent && !buttonPressedLast) {
    tempThreshold += 1.0; 
    Serial.print("Temperature threshold increased to: ");
    Serial.println(tempThreshold);
    delay(200); // Debounce
  }
  
  buttonPressedLast = buttonPressedCurrent;
}