Chapter 18. Pulse-Width Modulation - PWM

Using the pulse-width modulation (PWM) technique, we can encode a message into a pulsing signal (usually a square waveform) to generate an analog signal using a digital source as a microcontroller. Then, these messages can be used to control the power supplied to electrical motors or other electronics devices or, as we're going to show into this chapter, to control the position of a servo motor.

Using a few Bash commands, we'll see how an embedded developer can use PWM signal generators, available in GNU/Linux systems, to set a specific axis position of a servo motor.