Change the length of the time that the LED is ON. You can make the LED
look like a strobe light by making the “ON” time very, very short.
Change the length of time that the LED is OFF. You will find out there is
a shortest time (probably greater than 10 ms) below which you can’t see that
the LED is turned off or not.
Change the pattern. Tell the LED to make 3 short blinks, followed by a
relatively long delay.
Change the pattern again. Tell the LED to make 3 short blinks, followed by
three long blinks, followed by three short blinks, followed again by a rather
long delay. Congratulations! You have just made the LED blink out the
equivalent of “SOS”!
Re-write the sample sketch so that it turns on the LED one time, delays
for 1 second, and then turns it off until the board is reset.