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Hi Amanda, very helpful tutorial! Question for you... I'm trying to use this for measuring speed and distance of my son's hamster wheel. And will try to use a light sensor and LED to measure the revolutions of the wheel (no wires for the hamster to chew). For now just testing the code with a pushbutton switch to simulate RPMs. The radius of the wheel is 4.25 inches. With low RPMs (between 1 and 2 revs per second), I get a fixed speed of 15.02mph. Higher revs start to give me fluctuating speeds as expected. When RPMs drop to 0, it shows a speed of 0.002 mph (never 0.00). Any suggestions on how to fix it? Thanks in advance!
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