Tennis Fault And Let Detection
Tags: MI# 479
While it seems obvious enough, I am unaware of any automatic system for determining whether a tennis ball has made contact with the "tape" at the top of the net. Having played in college, (where all but the most important matches are self-officiated) the subject of whether the ball has tipped the net on during service was at times contentious. Using my method, accurate detection is achieved for minimal expense. A pressure sensitive electrical contact strip engineered the same way as a garage floor sensor for positioning your car, but much more sensitive, is the basic element of the system. Slight pressure closes a simple circuit, the cotacts of which run paralel down the length of the strip at close tolerances. The net itself is tensioned by a cable with a piezo quartz capacitor at the static anchor point and enough discrimination circuitry is wired into it to differentiate the brief impact of a ball or racket from wind load, extra weight from moisture, or other static loads. An LED lights for five seconds indicates the status of the point. The total cost is under two hundred dollars.
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