I have a feeling your code is operate so fast that you can't see it. Try commenting out the microseconds and bringing delay up to a second to see if it starts to blink with more repetition.
delay (1000);
I have a feeling your code is operate so fast that you can't see it. Try commenting out the microseconds and bringing delay up to a second to see if it starts to blink with more repetition.
delay (1000);