| CPC A63H 1/30 (2013.01) [G01D 5/14 (2013.01); A63H 1/24 (2013.01); A63H 1/28 (2013.01); A63H 2200/00 (2013.01); H04B 1/02 (2013.01)] | 14 Claims |

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1. A system comprising:
a reference device;
a yo-yo comprising:
two shells connected by an axle; and
a sensor housed in one of the two shells, the first sensor being configured to measure a parameter related to movement of the yo-yo; and
a processor configured to determine a position of the yo-yo relative to the reference device based on signals transmitted between the yo-yo and the reference device, or based on a magnetic field strength between the yo-yo and the reference device,
wherein the reference device is separate and distinct from the yo-yo.
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