RC Servo Theory

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The control signal for an RC Servo is a digital pulse train that looks something like this:

555 control.jpg

Here, the width of the “high” pulse, t, determines the angle of the rotor. The width, measured in time, will be in the range of

And the frequency of the pulses, given by


is around 40-50Hz (T ≈ 20ms).

For a practical circuit, see 555 Servo Circuit.