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Wireless timing system for drag racing RC cars
Mike Kohn, creator of “remote control food”, used a pair of Pololu Wixel programmable USB wireless modules to control a drag racing “Christmas tree” (the traffic lights used at the start of a drag race) and finish line electronics. They communicate wirelessly (with the Wixel’s TI CC2511F32 integrated 2.4 GHz radio transceiver), timing the race and displaying the result on 7-segment LCDs. Instead of using C like most of our customers, Mike tried out his own 8051 assembler naken_asm on this project, even rewriting our example radio communication code himself in assembly. The system has break beam sensors at both the start line (to detect false starts) and the finish line. Each sensor is made from two inexpensive parts: a red diode laser and a light sensor transistor.
His assembly source code, schematics, and additional pictures and vidoes are available on his web page.