What is a servo?
“Servo” in this case refers to R/C or ‘hobby’ servos used in radio-controlled cars, boats and planes. These are small, self-contained positioners consisting of a motor, geartrain, and control electronics. As inputs, these servos need a source of power (4.8 to 6Vdc) and a control signal (variable-width pulses repeating at a 60-Hz rate). Servos’ mechanical output is a shaft, disk, or lever whose angle is proportional to–controlled by–the width of the pulses at the input.
