/*const int ledPin = 13; // Built-in LED on most Arduino boards

void setup() {
  pinMode(ledPin, OUTPUT); // Set the LED pin as an output
}

void loop() {
  digitalWrite(ledPin, HIGH); // Turn the LED on
  delay(1000);                // Wait for 1 second (1000 ms)
  digitalWrite(ledPin, LOW);  // Turn the LED off
  delay(1000);                // Wait for 1 second
}
*/
#include <avr/io.h>
#include <util/delay.h>

int main(void) {
    // Set PB5 (Digital Pin 13 on Uno) as output
    DDRB |= (1 << PB5);

    while (1) {
        // Toggle LED
        PORTB ^= (1 << PB5);

        // Wait 1 second
        _delay_ms(1000);
    }
}