USB-Powered Health Sensor Prototype

I need a compact, self-contained sensor device that lets a user plug in a single USB cable and instantly see two key readings on a tiny 0.96-inch OLED: blood-oxygen saturation and body temperature. The intended market is personal wellness, so accuracy should be solid for day-to-day tracking but does not have to meet formal medical-device certification.

Core functions
• SpO₂ and pulse detection through a fingertip probe
• Non-contact body temperature via an IR sensor
• Simple, always-on OLED interface that alternates or splits SpO₂ and temperature values

Hardware expectations
You will design the custom PCB, choose appropriate components, lay out the board, and supply the full KiCad/Altium files plus a clear circuit diagram. The board should accept 5 V from a standard USB-A or USB-C cable (no batteries on board). Component selection should prioritize low power and a slim form factor; I’m aiming for a pocket-sized enclosure.

Firmware
Write clean, well-commented embedded code (C/C++ or MicroPython are both fine) that handles sensor drivers, basic averaging for stable readings, and the OLED refresh. Source code and build instructions are part of the hand-off.

Deliverables
1. One fully assembled, tested prototype that meets the functional brief
2. Gerber, BOM, and schematic files
3. Complete firmware source with a brief README
4. Short video or photo set showing the prototype in operation over USB

I’m happy to iterate quickly on review builds, but the first milestone will be schematic and component approval, followed by PCB layout, then firmware integration, and finally shipment of the working unit.