In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

GPS is useful to get you close to the owner. Then you could use IR to get a direction TO the owner, and ultrasonics to determine how far away the owner is.

I thought about doing a similar project (so much so that I registered the domain name "www.followmecart.com"), but paying customers come first, so it was put on the back burner.

Good luck,

Bean

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