Hardware and software designed for practical assistive use.
HC‑SR04 ultrasonic module with median filtering for reliable distance estimates.
WS2812B LED strip and RGB indicator LED signal system states clearly.
Four-button input and 16×2 LCD status display with robust initialization.
Micro‑servo for gesture feedback and piezo buzzer for tones and guidance beeps.
Non‑blocking state machine, debounced inputs, and power‑aware LED handling.
Voice assistant, caregiver web app, battery pack, and refined enclosure.
| Scenario | Function | Outcome |
|---|---|---|
| Hallway navigation | Distance‑based audio feedback | Reduced collision risk |
| Daily routine | Visual reminders via LEDs/LCD | Better adherence |
| Engagement | Entertainment mode | Improved mood and interaction |