#define DHTPIN 2     // Digital pin connected to the DHT sensor
#define DHTTYPE DHT22 // DHT 22 (AM2302)

unsigned long lastReadTime = 0;
byte data[5];

void setup() {
  Serial.begin(9600);
  pinMode(DHTPIN, INPUT_PULLUP);
  Serial.println("DHT22 sensor setup");
}

void loop() {
  unsigned long currentTime = millis();
  if (currentTime - lastReadTime >= 2000) {  // Wait at least 2 seconds between readings
    lastReadTime = currentTime;
    if (readDHT22()) {
      float humidity = data[0] + data[1] * 0.1;
      float temperature = data[2] + data[3] * 0.1;
      Serial.print("Humidity: ");
      Serial.print(humidity);
      Serial.print(" %\t");
      Serial.print("Temperature: ");
      Serial.print(temperature);
      Serial.println(" °C");
    } else {
      Serial.println("Failed to read from DHT sensor!");
    }
  }
}

bool readDHT22() {
  byte count = 7;
  byte currentBit = 0;
  
  // Initialize data array
  for (int i = 0; i < 5; i++) data[i] = 0;
  
  // Send start signal
  pinMode(DHTPIN, OUTPUT);
  digitalWrite(DHTPIN, LOW);
  delay(20);
  digitalWrite(DHTPIN, HIGH);
  delayMicroseconds(40);
  pinMode(DHTPIN, INPUT_PULLUP);
  
  // Wait for response signal
  unsigned int loopCount = 10000;
  while(digitalRead(DHTPIN) == HIGH) {
    if (--loopCount == 0) return false;
  }
  
  // Read the response signal
  loopCount = 10000;
  while(digitalRead(DHTPIN) == LOW) {
    if (--loopCount == 0) return false;
  }
  
  loopCount = 10000;
  while(digitalRead(DHTPIN) == HIGH) {
    if (--loopCount == 0) return false;
  }
  
  // Read the data
  for (int i = 0; i < 40; i++) {
    loopCount = 10000;
    while(digitalRead(DHTPIN) == LOW) {
      if (--loopCount == 0) return false;
    }
    
    unsigned long startTime = micros();
    
    loopCount = 10000;
    while(digitalRead(DHTPIN) == HIGH) {
      if (--loopCount == 0) return false;
    }
    
    if (micros() - startTime > 40) {
      data[currentBit / 8] |= (1 << (7 - currentBit % 8));
    }
    currentBit++;
  }
  
  // Verify the checksum
  if (data[4] == ((data[0] + data[1] + data[2] + data[3]) & 0xFF)) {
    return true;
  } else {
    return false;
  }
}