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Open AccessArticle

Low-Cost Servomotor Driver for PFM Control

School of Engineering, University of Cadiz, PC 11519 Puerto Real, Cadiz, Spain
Author to whom correspondence should be addressed.
Sensors 2018, 18(1), 93;
Received: 20 November 2017 / Revised: 16 December 2017 / Accepted: 28 December 2017 / Published: 31 December 2017
(This article belongs to the Section Physical Sensors)
PDF [6572 KB, uploaded 31 December 2017]


Servomotors have already been around for some decades and they are extremely popular among roboticists due to their simple control technique, reliability and low-cost. They are usually controlled by using Pulse Width Modulation (PWM) and this paper aims to keep the idea of simplicity and low-cost, while introducing a new control technique: Pulse Frequency Modulation (PFM). The objective of this paper is to focus on our development of a low-cost servomotor controller which will allow the research community to use them with PFM. A low-cost commercial servomotor is used as the base system for the development: a small PCB that fits inside the case and allocates all the electronic components to control the motor has been designed to replace the original. The potentiometer is retained as the feedback sensor and a microcontroller is responsible for controlling the position of the motor. The paper compares the performance of a PWM and a PFM controlled servomotor. The comparison shows that the servomotor with our controller achieves a faster mechanism for switching targets and a lower latency. This controller can be used with neuromorphic systems to remove the conversion from events to PWM. View Full-Text
Keywords: PFM; servomotor; robotics; neurorobotics; potentiometer PFM; servomotor; robotics; neurorobotics; potentiometer

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Aragon-Jurado, D.; Morgado-Estevez, A.; Perez-Peña, F. Low-Cost Servomotor Driver for PFM Control. Sensors 2018, 18, 93.

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