The Sensor unit is generating infrared and when a runner runs in front of it,
it detects reflection from the runner and sends radio signal to the Timer
Components of FASTRun-R
The Timer unit consists of a commercial stopwatch Casio HS-70 and
a radio signal receiver. The receiver receives the singals from the Start
unit and the Sensor unit and controls the stopwatch to measure time.
The Start unit makes an electronic pistol sound.
Together with the sound, it sends a radio signal to the Timer unit.
The Sensor unit is continuously radiating infrared light and
detects reflection from a runner.
When the runner is detected, it sends a radio signal to the Timer unit.