Appropriate electronics and sensor technology to use for scoring closest Nerf football air cannon shots? The general concept would be to have a target area marked on the ground around a target device and a unique sensor/tag/id/etc embedded within each foam ball (up to 255 unique balls may exist within the target field by the end of play.)
The target field is approximately 500ft x 500ft. Participants can launch the device from cannons positioned on each side of the target field (4 locations.) This game will be used at festivals so the distance error measurement isn't a hard number or percent (we will weigh the implementation cost against accuracy) perhaps up to +/- 5% of distance would be acceptable.
Ease of field setup is paramount. This 'game' will be shipped to various locations and setup by volunteers. The preferred solution shall incorporate a single target box/device that runs on battery power and weighs less than 20 lbs. Rechargeable batteries (12v max) should support 5 hours target run time. The location will be outdoor in an open level field. The tracking should continue to work in wet/rainy conditions.
Multiple balls/throwables may be in flight simultaneously.
Final direction and distance from target results are desired for each shot. The target data will be broadcast to a mobile app for spectators/participants.