Zac got Scalextric for Xmas and Liam got Mindstorms NXT so the obvious thing to do was to built a lap timer! It worked so much better than we could have hoped. We used a light sensor from the lego which was sampling every 3 thousands of a second which meant the lap times were accurate to more than a hundredth of a second!!!
Poor Zac was eventually begging me to stop racing his cars at their limit as I was crashing them every few laps at high speed trying to get a faster lap time ;-) Thank goodness my brother or dad aren't here else we would still be racing!
I might add a video if I get the chance.
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