Contact person: Business Client

Phone:Show

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Location: Valencia, Spain

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I’m building a compact, medically-oriented wearable that measures bio-impedance through four skin electrodes, monitors temperature, optionally logs motion with an IMU, and streams everything to an iPhone via BLE for HealthKit integration. The board must also listen for, and correctly parse, broadcasts from both Abbott and Dexcom continuous-glucose patches so the data can be combined in the same mobile app.

Core requirements
• MCU: Cortex-M4 class; I’m open to either the nRF52840 or the STM32U5—choose whichever lets you meet the radio, power, and memory demands most elegantly.
• AFE: MAX30009 wired to four electrode pads for single-ended or differential bio-impedance measurements.
• Sensors: digital temperature sensor (your choice of proven part); optional 6-axis IMU footprint.
• Wireless: full-featured BLE stack, pairing and data-streaming tested against iOS/HealthKit, plus reliable reception of Abbott and Dexcom CGM packets.
• Power: single-cell Li-Ion with on-board charger, fuel-gauge option, and USB-C for charging/debug.
• Form factor: wrist-wearable footprint (roughly 35 × 40 mm max) with castellated or board-edge test points for programming.
• Reference material: I will supply an ESP32-based design—use it only as a functional starting point and port everything to the chosen Cortex-M platform.

Deliverables
1. Complete schematic and multi-layer PCB layout (Altium or KiCad preferred) including impedance-controlled RF traces and test-point strategy.
2. Production-ready Gerbers/ODB++, pick-and-place files, and an annotated BOM with medical-grade component options flagged.
3. Pinout document showing all MCU, sensor, and AFE connections plus suggested enclosure standoffs.
4. Minimal firmware that boots the board, initializes MAX30009, streams dummy impedance/temperature values over BLE, and confirms packet capture from both CGM brands (mocked data is fine at this stage).
5. Brief bring-up guide so any assembly house or test engineer can reproduce your results.

Acceptance
I will consider the job complete when a first-article PCB powers up on my bench, advertises over BLE, passes impedance self-test, and logs valid Abbott and Dexcom packets in a provided iOS demo app.

If you need specific pin-maps, BLE UUID definitions, or CGM protocol notes, let me know and I’ll share them immediately. I’m ready to move fast and can answer hardware questions in real time." (client-provided description)