Thanks for looking! Our toy involves a ball and a target. We want to enable the target to log a score when contacted by the ball. However, our problem is that the target must only log a score when contacted by the ball. A score should not be logged if only a foot or other body part contacts the target. The target is a three dimensional surface. The target is not a "pass-through target" ie net, hoop, hole. Target is not tethered. Cameras are not an option. The solution could include a a custom ball or a skin that fits over a ball. Thanks again!
This might be way too expensive for your toy, but have you thought about NFC (Near Field Communication)? https://en.wikipedia.org/wiki/Near_field_communication
How about the same technology that door access key fobs use? Not sure if RFIDs are accurate enough for your application, but it might be good enough.
