The Arduino Uno Board (1) with a PIR sensor (2) is connected to a computer running Flash Player.

The PIR sensor is connected to a slot car race track (3) and monitors your current lap time.

Once a lap is complete, the time is registered into a Flash interface (4) which will keep track of your best lap time and your previous 10 laps.

Also, in Flash there is a speedometer that tracks your average speed from your previous lap.