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How fast can a Fidget Spinner spin? Well, it depends on what spins it. Let's use compressed air.
That sounds fast, it's actually scary to hold!!! But how fast?
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To make the measurement we used a simple LED as a sensor. A bright light shines down onto the LED. The arms of the Fidget Spinner block the light as they move over the LED creating electrical pulses.
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The sensor LED is connected to a Tektronix MDO4104C to measure the pulses. The scope (along with a few thousand other features) allows an engineer to quickly study waveform measurements with cursors. After a little math we get our answer; well over 10,000 RPM.
That's fast!
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