const uint8_t pinLED = 13;
const uint8_t LED_OFF = LOW;
const uint8_t LED_ON = HIGH;
const unsigned long HALF_SECOND = 500UL;
void loop()
{}
void setup()
{
pinMode(pinLED, OUTPUT);
digitalWrite(pinLED, LED_OFF;
int loop_counter = 100;
while ( loop_counter-- )
{
digitalWrite(pinLED, LED_ON);
delay(HALF_SECOND);
digitalWrite(pinLED, LED_OFF);
delay(HALF_SECOND);
}
}