I am going to built a routed 4 lane slotcar track*. Obviously you need some timekeeping/lapcounting solution for such a toy.You can buy various sensors and interfaces but there is also some free software around for which you can built your own interfaces.Most instructions are for printer or joystick...By: heavyweather
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from Instructables: exploring - technology - robots http://ift.tt/1wt58L7
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