PCB Design for Ultra-Compact Wearable Posture Coach (nRF54L15 + LSM6DSO + Haptics) - 28/03/2026 23:07 EDT

I'm developing a compact wearable posture coach device that sticks to the upper back/neck area to detect poor posture and provide real-time haptic feedback. The device is ultra-compact, ultra-low power, and optimized for consumer health monitoring and on-the-go communication. I already have a detailed feature map, enclosure concept, and updated technical specification drawing (v3 attached

• 34mm × 34mm × 8mm form factor). What I need now is a production-ready PCB that brings the health-sensing, BLE communication, and haptic feedback together in the smallest and most power-efficient form factor possible. Here’s what success looks like for this engagement: A complete schematic that ties together the chosen health-sensing components, low-energy wireless module for phone pairing, and a dedicated driver path for the haptic actuator. A multilayer PCB layout optimized for size, antenna performance, battery life, and ready for a standard SMT assembly line. Full manufacturing data (Gerbers/ODB++, pick-and-place, drill files), a clean BOM with active part numbers in supply, and the editable project file (Altium or KiCad preferred). Basic DFM and signal-integrity checks passed so the first prototype round goes smoothly. Specific Technical Requirements (based on v3 spec drawing attached): Enclosure target: 34mm × 34mm × 8mm 3-axis IMU sensor (LSM6DSO or BMI270 recommended)
• must be placed perfectly central on the PCB for accurate posture detection. Ultra low-power BLE SOC (nRF54L15 recommended or nRF52840) with proper antenna keep-out zone. Compact LRA haptic actuator (e.g. Vybronics VG0640001D) with DRV2605L haptic driver. Battery management for 120-150mAh ultra-thin Li-Po (max 1.2mm thick). USB-C charging + status LED. Pairing / Calibration Button: Add a recessed tactile button on the right side of the front enclosure (as shown in v3). The button must be deeply recessed (flush or slightly below the surface) to prevent accidental pressing when the device is adhered to the skin. Use a low-profile tactile switch suitable for side mounting. It should be accessible with a fingernail or thin tool for Bluetooth pairing and manual calibration, but protected from unintentional activation during normal wear. If you have a track record with wearable boards — especially those mixing sensors, BLE, and haptics — please mention your experience and any recommendations on pin counts, sensor choices, or firmware hooks before we lock the design. Please review the attached v3 technical specification image carefully before bidding. Looking forward to your questions and proposal. Budget: EUR 450–850 Skills: Electronics, Electrical Engineering, PCB Layout, Product Design, Circuit Design, Bluetooth Low Energy (BLE), Antenna Design, DFM (Design for Manufacturing), Embedded Systems, Altium Designer