10 seconds count down using Arduino

This is one of my 1st Arduino projects. Along with Arduino, I've used a seven segmeent led display and a piezzo buzzer. First, it beeps to indicate start. Then, counts down from 9 to 0, beeps three times. Finally, it beeps for the last time but this time the beep lasts longer.

[original story: Let's Make Robots]

Let's Make Robots 11 Jan 15:32
10  arduino  count down  display  led  led display  microcontroller  programming  seconds