OpenAssistive — Bill of Materials (BOM) v1.0
Author: Milton Rodolfo Amador Zúniga
Copyright (C) 2026 Milton Rodolfo Amador Zúniga
License: GNU General Public License v3 (GPLv3)
Non-profit open social technology initiative.
Scope
Component list for OpenAssistive prototype v1 focused on low cost, modularity,
global availability, and repairability.
Core Compute Module
| Component | Primary | Alternative |
|---|
| SBC | Raspberry Pi 4 | Raspberry Pi 3B+ |
| Storage | MicroSD 64–128GB | High-endurance SD |
| Audio | USB sound adapter | Headset USB |
Cane Sensor Module
- 2× ToF sensors (VL53L1X preferred)
- ESP32 or RP2040 microcontroller
- Small protective enclosure
Haptic Feedback
- Coin vibration motors (2–4)
- Motor driver (MOSFET / ULN2003 / transistor)
Camera Module
- Raspberry Pi Camera Module
- or USB wide-angle webcam
- Shoulder strap mount
Audio Module
- Mono earbud with inline control
- Optional bone-conduction headset
- Lavalier or inline microphone
Power System
- USB Power Bank — 20,000 mAh — 3A output
- Short reinforced USB cable
Connectors & Wiring
- Magnetic breakaway connector
- Flexible silicone wire
- JST connectors
- Heat shrink tubing
Textile Integration
- Vest or harness with cable routing
- Industrial velcro and elastic straps
Estimated Prototype Cost
- Low-cost build: ~180 USD
- Typical build: 220–260 USD
- Enhanced audio build: ~300 USD
Replacement Philosophy
All parts should be replaceable, globally sourceable, and non-proprietary.
No vendor lock-in.
OpenAssistive Project — Open Social Assistive Technology