Analog servo+Arduino/RC Mottagare

RC servos are composed of an electric motor mechanically linked to a potentiometer. Pulse-width modulation (PWM) signals sent to the servo are translated into position commands by electronics inside the servo. When the servo is commanded to rotate, the motor is powered until the potentiometer reaches the value corresponding to the commanded position.

Digital Servos vs Analog Servos
What is the difference between an analog and digital servo?

Digital servos, at the user end, are controlled no differently than analog servos. The difference is in how the servo motor is controlled via the circuit board (amplifier). The motor of an analog servo receives a signal from the amplifier 30 times a second or at 30Hz. This signal allows the amplifier to update the motor position. Digital servos use a high frequency amplifier that updates the servo motor position 300 times a second or at 300Hz. By updating the motor position more often, the digital servo can deliver full torque from the beginning of movement and increases the holding power of the servo. The quick refresh also allows the digital servo to have a tighter deadband.

An "analog" servo compares the width of the pulse to the position of the arm/wheel. If they don't match, it attempts to move the arm/wheel to the matching position. If external force resists, the servo may be a little slower to get the arm to the matching position.

A "digital" servo does the EXACT SAME THING, only "better". "Better" means that it provides more torque, "faster". "Faster" means that a smaller mismatch of arm position to PWM width will result in more torque. See the diagrams in the link below. Because of this superior match of wheel/arm position to the input signal, Digital servos will have a much narrow "deadband" than analog, and feel/fly better.