How to measure the speed of DC motor in 5 1 single chip microcomputer system, how many methods are there, and what is the principle of each method?

1 The power supply leads out the pulse signal, amplifies and shapes it, and calculates the number of revolutions according to the number of poles. Maybe the power supply needs a small inductor.

Using Hall element, place a magnet on the shaft and measure the rotating speed.

The 3-axis is coated with semi-reflective and semi-non-reflective film, and the light-emitting tube-photosensitive tube receives, amplifies and shapes it without interference from strong light.

The fan blade is installed on the 4-axis, and the light-emitting tube-photosensitive tube receives, amplifies and shapes it without interference from strong light.

The 5-axis is equipped with a rotary encoder, which can not only know the rotational speed, but also know the angle and direction.

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