Chapter 6. Stroboscope Tachometer
In this chapter we’re going to explore what we can do with careful timing when we have some information about the rotation of an object.
To save us a bit of work, we’ll use a premade motor and sensor combination. Probably the cheapest and most readily available source of these is the computer industry. Since computer fans need to be highly reliable (running 24 hours a day, 7 days a week, for years on end), brushed motors couldn’t easily be used because the brushes would wear out. Instead, computer fans use brushless motors.
To help with efficiency and to lower noise, it’s often useful to run these fans slowly when the computer doesn’t need to dissipate as much heat. To do that reliably, the computer needs to ...
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