void setup() {
  pinMode(LED_BUILTIN, OUTPUT); // Initialize digital pin as an output
  randomSeed(analogRead(A0)); // Seed the random number generator
}

void loop() {
  int blinkDuration = random(100, 800); // Random delay between 100ms and 800ms
  
  digitalWrite(LED_BUILTIN, HIGH); // Turn the LED on (high voltage)
  delay(blinkDuration);
  digitalWrite(LED_BUILTIN, LOW); // Turn the LED off (low voltage)
  delay(blinkDuration);
}