A battery-powered ESP32 countdown timer with 3D printed snap-fit case - track deadlines, run a stopwatch, save state across power cycles, and dodge some bullets while you wait.
iot arduino esp32 embedded-systems cybersecurity india countdown-timer lipo fusion360 lcd1602 pla 3d-printed arduino-cpp nvs battery-management snap-fit
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Updated
May 11, 2026 - C++