Kronograf
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- Developer reports Claude Code wrote smartwatch firmware in three days
In a first-person account, developer cyberdinn says Claude Code using Opus 5.5 wrote Kronograf, MIT-licensed firmware for the LilyGO T-Watch 2020 V1, in three days. The project includes three watch faces, 13 apps, Bluetooth iPhone notifications, a network toolbox, a macOS simulator and free prebuilt binaries. The developer says they supplied the brief, architecture and stage-by-stage decisions, and handled wrist testing. The process used staged builds, device checks and host testing. Physical tasks remained necessary: the developer reports a loose micro-USB connector, battery-sleep bugs diagnosed through serial logs, and wrist-raise thresholds that still require tuning.
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