// Define the LED pin
#define LED_PIN 0  // PB0 (Physical Pin 5 on ATtiny85)

void setup() {
    pinMode(LED_PIN, OUTPUT);  // Set PB0 as an output
}

void loop() {
    digitalWrite(LED_PIN, HIGH);  // Turn LED on
    delay(500);                   // Wait 500ms
    digitalWrite(LED_PIN, LOW);   // Turn LED off
    delay(500);                   // Wait 500ms
}