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Pololu 302 Elenco 21-881 Sound Reversing Car SC8LUU Linear Bearing Bushing for 8mm Shafts CNC Router Mill Linear Stage The SPIKY smartwatch uses PPGPololu 302 Elenco 21 881 Sound Reversing Car The Pololu 302 Elenco 21 881 Sound Reversing Car is an educational robotics kit that combines mechanical assembly with sound activated reverse functionality, designed to teach fundamental principles of motor control, sensor integration, and autonomous behavior. Electronics educators, STEM instructors, and hobbyists use this kit to demonstrate practical applications of sound detection circuits and