Action Tracer: An Extendable, Low-Cost and Open-Source Motion Tracking Kit Based on 6-Axes Inertial Measurement Units

This paper presents the development and evaluation of an extendable motion capture device, Action Tracer, designed to assist with training repetitive motions in sports and activities. The system has feedback capabilities and an API for device connectivity, and can be configured for different sports and operated from an Android device while remaining low cost relative to devices on the market. The paper covers the use of marker-based motion capture systems, inertial measurement units, and biofeedback, and outlines the design specifications for the essential subsystems of the system. The evaluation results show that the developed system can keep, on average, within 5% of a markerless camera-based motion capture system with a precision of 10%. Overall, this paper contributes to the field of motion capture technology by presenting a low-cost, versatile system that can assist with training and rehabilitation for various sports and activities. The system's technical details and evaluation are presented, with a comparison to a markerless camera-based motion capture system. The paper provides a concise overview of the system's design, evaluation, and potential applications.