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Accelerate meter
This is a device for measuring acceleration. It can measure +/- 2 g.
As it contains a microprocessor, it an also measure time.
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TACHOMETER
This easy tachometer can read from 100 RPM to 99,900 RPM +- 1%, +- 100 RPM at 30000 RPM. The key point in this design is using hardware to do a \"divide by two\", actually, it is to get a duty rate 50/50 square wave for software to detect if input
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