PCB Design for Wearable Assistive Device
Budget: $15 – $25 CAD
I have built a working prototype of a wearable assistive device for deaf/hard-of-hearing individuals. The device uses an Arduino Nano, an ultrasonic sensor, and a vibration motor to provide haptic feedback when an object approaches from behind. The prototype currently runs on a breadboard with jumper wires and is powered by a 3.7V LiPo battery through a TP4056 charging module.
The goal is to move from this breadboard prototype to a compact, durable PCB version that can be used for further testing and presentation.
What I Need Done
PCB Design / Layout
Create a 2-layer PCB (double-sided with plated through-holes).
Integrate the following modules/components:
Arduino Nano (Elegoo, ATmega328P, CH340)
HC-SR04 Ultrasonic Sensor (connected via pins/headers)
TP4056 LiPo Charger Module (connected to battery input and Arduino power rails)
3.7V LiPo Battery Connector (JST)
3V Coin Vibration Motor
Include appropriate headers/connectors for modules so they can be easily swapped if needed.
Route 5V and GND to multiple components (Nano, sensor, charger, motor).
BOM (Bill of Materials)
Based on provided parts list (already prepared).
Include manufacturer part numbers or equivalent suggestions.
Optimize for cost-effective, off-the-shelf parts.
Deliverables
Complete PCB design files (Eagle/KiCAD/Altium format).
Gerber files ready for manufacturing.
Updated BOM in standard format (Excel).
Optional: simple 3D visualization/render of the PCB.
Constraints
PCB size: approximately 60 mm × 80 mm (adjustable for layout).
Budget: max $300 (for design work only).
Prototype quantity: 1 (may expand to 2–5 later).
Future Work (Phase 2, if successful)
Assist with enclosure design (simple wearable case, e.g., belt clip or strap mount).
Optimize layout for multiple ultrasonic sensors (left, center, right) for directional detection.
Power optimization for longer battery life.
What I Will Provide
Current breadboard wiring diagram.
Working Arduino code (tested on prototype).
Existing BOM (Excel).
Photos of prototype for reference.
The goal is to move from this breadboard prototype to a compact, durable PCB version that can be used for further testing and presentation.
What I Need Done
PCB Design / Layout
Create a 2-layer PCB (double-sided with plated through-holes).
Integrate the following modules/components:
Arduino Nano (Elegoo, ATmega328P, CH340)
HC-SR04 Ultrasonic Sensor (connected via pins/headers)
TP4056 LiPo Charger Module (connected to battery input and Arduino power rails)
3.7V LiPo Battery Connector (JST)
3V Coin Vibration Motor
Include appropriate headers/connectors for modules so they can be easily swapped if needed.
Route 5V and GND to multiple components (Nano, sensor, charger, motor).
BOM (Bill of Materials)
Based on provided parts list (already prepared).
Include manufacturer part numbers or equivalent suggestions.
Optimize for cost-effective, off-the-shelf parts.
Deliverables
Complete PCB design files (Eagle/KiCAD/Altium format).
Gerber files ready for manufacturing.
Updated BOM in standard format (Excel).
Optional: simple 3D visualization/render of the PCB.
Constraints
PCB size: approximately 60 mm × 80 mm (adjustable for layout).
Budget: max $300 (for design work only).
Prototype quantity: 1 (may expand to 2–5 later).
Future Work (Phase 2, if successful)
Assist with enclosure design (simple wearable case, e.g., belt clip or strap mount).
Optimize layout for multiple ultrasonic sensors (left, center, right) for directional detection.
Power optimization for longer battery life.
What I Will Provide
Current breadboard wiring diagram.
Working Arduino code (tested on prototype).
Existing BOM (Excel).
Photos of prototype for reference.