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I spun the input and watched for it to move 1/10 of a mile (120 Revs), then multiplied that by 10 to get revs/clocked mile, then multiplied by 1.22 (my tires are oversized) and got 1464 pulses/mile.
At 70 MPH, that is 7/6 miles/minute, or 1464(7/6) per minute. 1708 pulses/minute= 28.5 pulses/second.
29 HZ. I wonder if the switch will work. I imagine that it will, but the question is for how long.
If that wears out, I think I will try a switch from an old telephone. The kind with the two strips of springy metal held together with insulators, and when they are pushed on (or not pushed on) they have contacts that come together.
Like distributor points. Hmm, I could use those, too.
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