i am doing a project for my final year in collage,i want to put a chip in a football so that every time it crosses the line a wrist band the
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M$2 Answers
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M$Assumption 1: By "line" I assume you mean the line separating the endzones from the rest of the field.
Assumption 2: you want accuracy to less than the length of the ball
Just off the top of my head, One way of doing it would be to put a beacon either in the end zones, or in the ball. you would just need to determine how far it is from the receiver. however with consumer grade off-the-shelf parts, I think you would be lucky to get better than 10 foot accuracy. Another possibility would be to use some highly directional antennas placed on the line of interest. Again you have a problem of accuracy (probably +/-4foot or worse, dependent on range)
I'll have to give it more thought.
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M$
Okay, that clarifies some things, if It is going to be just the ball, and not someone holding it, look into a light fence type system, maybe a scanned laser beam, or columns of LEDs. If you use a light fence, you wouldn't even need to alter the ball.
its more for soccer & galic games if you know what i mean?its a problem that comes up now & again where the ball hits the crossbar goes over the line & comes back out again,it happens so fast sometimes it can be disalowed or given witch can lose or win a game,thank for the answer if you have any more ideas that would be great. thanks again
will look in2 it cheers :)