How a lot of of us have an daily software that’s actually exceptional? Probable not numerous of us just take a appear all around your desk and turn out your pockets, but much more typically than not, what you’ll uncover is that anything you have is a thing that fairly considerably absolutely everyone else on the earth could have purchased far too. But not so if you’ve acquired this wonderful custom made RPN calculator in a wood circumstance.
This one particular arrives to us from [Shinsaku Hiura], who generally dazzles us with distinctive mechanical clocks and displays. This calculator solves a a lot more simple difficulty — the dearth of RPN calculators on the industry with the suitable keyboard really feel, especially with the big keys and light contact he ideal. Appropriately, the construct began with a numeric keypad, which at the time liberated of its USB interface was reverse-engineered to determine out how the matrix was wired. Subsequent up, a personalized PCB to hook up the keypad to an Arduino and a 20×4 Liquid crystal display display was milled up, even though a check situation was developed and printed to check out fitment. The remaining situation was milled from a block of stable walnut and fitted with an acrylic window, for a sharp seem with clean traces and satisfying colors.
As for the calculator itself, the demo below shows it likely by way of its paces. The code is clever since it leverages the minimal number of keys accessible by hiding all the scientific and engineering functions powering a “secret silver key” that was at the time the equals critical and certainly not wanted in RPN. Hats off to [Shinsaku] for a handsome and exceptional addition to his desk.