Servos does not use PWM, it uses PPM: PWM = Pulse width modulation, The pulse start at 0ms, and is high for the percentage of the time compared to the percentage of the voltage you want, 5v signal, if you want 1v, the pulse is 20ms High and 80ms Low.

Do servo motors need PWM?

Servos are controlled by sending an electrical pulse of variable width, or pulse width modulation (PWM), through the control wire. ... The PWM sent to the motor determines position of the shaft, and based on the duration of the pulse sent via the control wire; the rotor will turn to the desired position.

What signal do servos use?

Radio control servos are connected through a standard three-wire connection: two wires for a DC power supply and one for control, carrying a pulse-width modulation (PWM) signal. Each servo has a separate connection and PWM signal from the radio control receiver.