// Task delays (simulating time slices)
const unsigned long TASK1_DELAY = 500;
const unsigned long TASK2_DELAY = 1000;
const unsigned long TASK3_DELAY = 200;

unsigned long previousMillis1 = 0;
unsigned long previousMillis2 = 0;
unsigned long previousMillis3 = 0;

// Pin definitions
const int ledPin = 13;
const int buttonPin = 7;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);
  Serial.begin(9600);
}

void loop() {
  unsigned long currentMillis = millis();

  // Task 1: Blink LED
  if (currentMillis - previousMillis1 >= TASK1_DELAY) {
    previousMillis1 = currentMillis;
    digitalWrite(ledPin, !digitalRead(ledPin));
    Serial.println("Task 1: LED toggled");
  }

  // Task 2: Print message
  if (currentMillis - previousMillis2 >= TASK2_DELAY) {
    previousMillis2 = currentMillis;
    Serial.println("Task 2: Hello from Arduino");
  }

  // Task 3: Read button state
  if (currentMillis - previousMillis3 >= TASK3_DELAY) {
    previousMillis3 = currentMillis;
    int buttonState = digitalRead(buttonPin);
    Serial.print("Task 3: Button state = ");
    Serial.println(buttonState == LOW ? "PRESSED" : "RELEASED");
  }
}