To Do

  1. Modify the code so that it prints the blink time ranges from 50ms to 1000ms
    rather than 50ms to 500ms.

  2. Modify the code so that it prints the blink time on the Serial Console
    just before it calls the blink function; modify the code again so that it
    prints the analog input value and the blink time on every line.

  3. Add a second (green) LED to the ciruit, and modify the code so that when the
    analog input reading is 0 through 512, it causes the red LED to light up and
    change blink time, but at values higher than 512, the red LED is turned off,
    and the LED is off.