“For my son’s second birthday I decided to introduce him to die-cast cars and what better way than building a drag strip race track with an electronic start gate, timing and race results? While Hot Wheels does offer a 6-Lane Raceway and a number of other drag strip style tracks, they didn’t have the timing and electronic start gate that I knew an Arduino and some other bits could provide, so I set to work. The basic idea is was have a servo motor open the start gate by pulling down a hinged plate with dowel stoppers to release the cars and a photocell (photoresistor/LDR) pointed at an infrared LED on each track to detect each car crossing the finish line. “
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