RC Servo Theory

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

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

0.3ms ≤ t ≤ 2.5ms

$0.3 ms \leq t \leq 2.5 ms$

And the frequency of the pulses, given by f=1/T, is around 40-50Hz (T ≈ 20ms).

For a practical circuit, see 555 Servo Circuit.