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Servo control is a method of controlling a servo by sending a pulse-width modulation (PWM) signal. This signal is made up by a series of pulses having variable width, and the width, or less commonly the duty cycle, of these pulses determines the position that the servo will reach. This signal can be sent from a radio controller to the servo or from a microcontroller such as an Arduino. With PWM servos can be accurately controlled and programmed to perform a variety of actions.