Abstract
Human motion monitoring plays an important role in biomechanics and rehabilitation, where accurate measurement of limb movement is required. This study presents the design and experimental validation of a wearable system for ankle motion monitoring based on an inertial measurement unit (IMU). The proposed system integrates an IMU sensor, an Arduino Nano microcontroller, a microSD data logging module, and a battery-powered supply within a compact wearable device. Experimental tests were conducted to analyze three oснoвных movements of the ankle joint, including dorsiflexion–plantarflexion, inversion–eversion, and abduction–adduction. The IMU sensor was used to record angular velocity, linear acceleration, and orientation data in real time. The results demonstrate that the system is capable of capturing characteristic motion patterns and distinguishing between different types of ankle movements. The measured orientation angles (Roll, Pitch, and Yaw) correspond well to the expected kinematic behavior of the ankle joint. The obtained ranges are consistent with typical physiological values, confirming the reliability of the proposed approach. Overall, the developed wearable system provides an effective and practical solution for motion monitoring. It can be applied in rehabilitation and biomechanical analysis, while future work will focus on integrating additional sensors to enable a full multisensor platform.