The Hackster.io project page describes the Ghost Edge AI Sticker as a paper-thin, flexible sticker-style smart sensor node built around the Nordic Semiconductor nRF54L15 wireless SoC. The board uses a Flexible Printed Circuit (FPC) design, integrates a 6-axis IMU (LSM6DSO) and a digital PDM microphone, and runs on a dual-core architecture pairing an ARM Cortex-M33 host with a RISC-V FLPR remote core. Firmware includes over-the-air updates via BLE using MCUboot, real-time gesture classification via Edge Impulse, and open-source KiCad files, Gerbers, and a BOM. The author flags a 180-degree PDM microphone footprint rotation error that prevented audio feature validation on physical hardware – a practical caveat for anyone planning to reproduce the design.
