This got me thinking....how about a Raspberry Pi and camera module with a LED & battery on the car?
Have the Pi filter all colours from the image except the LED colour and then run a motion detection loop waiting for the LED to appear in the image. Each instance of the LED appearing in the image equals a positive lap count, set this against a timer loop and you have lap timing.
If you then had an Android app to download the stored lap times via Bluetooth, you'd have your lap times. Or maybe the Pi could serve a webpage?
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