Developer builds e-ink fridge magnet shopping list synced to phone via Wi-Fi

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A developer has created a fridge magnet shopping list using an M5Stack PaperMono device, which features an ESP32-S3 chip and an e-ink touchscreen. The device syncs with a mobile web app over Wi-Fi and also works offline, with the firmware spanning around 2,400 lines of C++. Notably, the entire codebase was generated using Claude Code, an AI coding assistant, without any hand-written code. The project was conceived as a practical test of how well AI tooling could handle firmware development for new hardware. The creator reports that the device is already in daily use by their family, marking a first for one of their home-built projects.

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