LadenZeit

LadenZeit is a minimalist OLED store tracker with rotary control — never miss opening hours again. An ESP32-C3 drives a small OLED display, browsed with a rotary encoder, to show which nearby shops are currently open.

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The device pairs with a Java Spring Boot backend that tracks opening hours and serves them to the ESP32-C3 firmware over the network.

Checkout https://github.com/kiu/LadenZeit for KiCad files, an OpenSCAD case, the Arduino firmware and the Spring Boot server.