An RPN calculator kit for $5

There’s something very retro about an RPN calculator with a 7 segment LED display - it’s programmable too, and offers complex numbers, matrix functions as well as numerical integration. Quite the project: Arduino-powered, unsurprisingly. A semi-flexible printed cover over tactile switches is a nice approximation to a calculator keyboard.

This 7 segment version (IVEE7) is a follow-on (and a cost-reduction) of an OLED version (IVEE) which also offers graphing facilitites:

Via hpmuseum forums

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