Brezžični sistem za ocenjevanje agilnosti na osnovi optičnih vrat in kinematičnih senzorjev

Accurate, field-ready timing and motion capture are essential for assessing agility beyond the limits of manual stopwatches. We present a modular measurement system that fuses infrared (IR) optical gates for robust event detection with a trunkworn inertial measurement unit (IMU) for kinematic profiling. Each sensing node is built on an Adafruit Feather M0 Wi-Fi microcontroller and communicates via UDP to a laptop server. Time alignment is accomplished without internet connectivity: the server establishes a relative epoch and executes a triple-handshake broadcast protocol, while timestamps are generated at the edge to avoid latency bias from transport or processing. Module- and device-level characterization shows that IR-receiver processing combined with interrupt service routine latency yields a per-event timestamp error of 0.54 ms ± 0.14 ms (latency ± uncertainty), and local clocks remain stable over the durations relevant to agility trials. In wireless operation, accepted synchronization attempts form tight response clusters in favorable RF conditions, whereas congested environments may require retries