Diving into the hardware design of an Open Smart Ring project

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A detailed technical guide covering the hardware design challenges of developing an open-source smart ring. The article explores PCB stackup design for flexible-rigid boards, BLE processor selection (Dialog DA14531), antenna design considerations, power management with wireless charging implementation, capacitive touch sensing using mutual capacitance, and haptic feedback solutions. Key challenges include extreme miniaturization constraints, battery management for curved Li-Ion batteries, FCC compliance for wireless components, and managing multiple ring sizes for manufacturing.

Smart Ring Development (Part 2) － Hardware Design