One of [Kale_3D]’s teachers had made an Arduino-powered calculator. ... Two of the buttons allow scrolling through not only standard arithmetic functions but trigonometric functions also.

However, daily use RPN calculators with large and light touch buttons are rare. So I made it by my own. – This calculator also has trigonometric, logarithmic and exponential functions.

DESIGN The 4x4 matrix keypad consists of 16 keys arranged in rows and columns. Each key press generates a unique combination of row and column signals, which can be decoded to determine the pressed ...