snipplets.dev/code/Arduino/init_blink.h

/*
    Author: Alexander Popov
    License: Unlicense

    Функция, которая моргает встроенным светодиодом
*/

void init_blink(int times, int delay) {
    for (int count = 0; count < times; count++) {
        digitalWrite(LED_BUILTIN, HIGH);
        delay(delay);
        digitalWrite(LED_BUILTIN, LOW);
        delay(delay);
    }
}