#define LED_PIN               13
#define BUTTON_PIN            2
#define BTN_DEBOUNCE_DELAY    200

bool btnState = false;

volatile unsigned int ledDuration = 1000;
volatile unsigned long lastDebounceTime = 0;
unsigned long lastLEDBlink = 0;


void setup() {
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(BUTTON_PIN), toggleLEDTime, FALLING);
  Serial.begin(115200);
}

void loop() {
  unsigned long currentTime = millis();
  if (currentTime - lastLEDBlink >= ledDuration) {
    btnState = !btnState;
    lastLEDBlink = currentTime;
    digitalWrite(LED_PIN, btnState ? LOW : HIGH);
  }
}

void toggleLEDTime() {
  unsigned long currentTime = millis();
  if (currentTime - lastDebounceTime >= BTN_DEBOUNCE_DELAY) {
    ledDuration *= 10;
    if (ledDuration%10 != 0) ledDuration = 100;
    Serial.print("LED duration set to ");
    Serial.println(ledDuration);
    lastDebounceTime = currentTime;
  }
}