const int ledPin = 8;               // LED connected to pin 8
unsigned long previousMillis = 0;   // Stores last toggle time
const long interval = 1000;         // Interval in milliseconds (1 second)
bool ledState = LOW;                // Current LED state

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

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

  if (currentMillis - previousMillis >= interval) {
    unsigned long diff = currentMillis - previousMillis;

    Serial.print("Previous: ");
    Serial.print(previousMillis);
    Serial.print(" | Current: ");
    Serial.print(currentMillis);
    Serial.print(" | Difference: ");
    Serial.println(diff);

    previousMillis = currentMillis;
    ledState = !ledState;
    digitalWrite(ledPin, ledState);
  }
}