#define LED_PIN 13 // Define the LED pin (built-in LED on pin 13 for Arduino Uno)

void setup() {
    // Set LED pin as output
    pinMode(LED_PIN, OUTPUT);

    // Initialize serial communication at 9600 baud rate
    Serial.begin(115200);;

    // Set up TIMER0
    TCCR0A = 0; // Clear Timer/Counter Control Register A
    TCCR0B = 0; // Clear Timer/Counter Control Register B

    // Load TIMER0 with initial value for 10 ms interval
    TCNT0 = 100;

    // Set prescaler to 64
    TCCR0B |= (1 << CS01) | (1 << CS00); // CS01 and CS00 are bits for 64 prescaler
}

void loop() {
    // Check if TIMER0 overflow has occurred
    if (TIFR0 & (1 << TOV0)) { // Check TIMER0 overflow flag in TIFR0 register

        // Toggle LED state
        digitalWrite(LED_PIN, !digitalRead(LED_PIN));

        // Print LED state to serial monitor
        Serial.print("LED is now: ");
        Serial.println(digitalRead(LED_PIN) ? "ON" : "OFF");

        // Clear the overflow flag by writing a 1 to it
        TIFR0 |= (1 << TOV0);

        // Reload TIMER0 with initial value for 10 ms interval
        TCNT0 = 100;
    }
}