Performance metrics validate design choices. In Chapter 4, we benchmarked every aspect—sensor accuracy, audio response, visual cues, and wireless reliability—to ensure our device meets clinical needs with precision and consistency.
Evaluating Distance Accuracy
Ultrasonic measurements held tight within the 2–60 cm target range, with negligible lag thanks to INT0-based timing. Consistent echo detection and moving-average smoothing delivered reliable readings for both modules under varied lighting and environmental conditions.
Audio and Visual Feedback Metrics
Speaker pitch spanned 500–1500 Hz, and volume ranged 45–65 dB, smoothly mapping hand positions to sound. LED transitions responded within milliseconds of threshold crossing, and the servo arrow aligned accurately, reinforcing user engagement through multisensory cues.
Wireless Communication Reliability
RF burst PWM transfers demonstrated minimal error across 6 cm: timing mismatches stayed within ±3 ms, translating to imperceptible audio variance. Continuous operation in lab tests confirmed stable connections and robust decoding under typical interference.
Engineering Achievements
Achieving 5/5 in Usefulness, Innovation, and Feasibility metrics, our device excelled in all categories. Real-time responsiveness, modular design, and seamless integration of hardware and software reflect significant engineering milestones—underscoring the system’s readiness for user trials.
Conclusion
Chapter 4 verifies that our Theremin Physiotherapy Device not only meets but exceeds its performance goals. These benchmarks build confidence for subsequent clinical testing and real-world deployment.