NumOS is an open-source scientific and graphical calculator built on the ESP32-S3 microcontroller with an ILI9341 display. It aims to match the functionality of commercial calculators like the Casio fx-991EX and TI-84 Plus CE, featuring a full computer algebra system, symbolic differentiation and integration, and a natural display mode that renders math as written on paper. It offers a hackable alternative to expensive proprietary calculators.
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