Simple and cheap enough to have a few laying around without worrying about charging every day or costing too much, not trying to compete with phones so they don’t need power wasting features. I really would love to see something like this based on a ZigBee/Bluetooth SOC.Ī calculator is the perfect base for smarthome control just like phones were the perfect integration point for everything else. Posted in handhelds hacks Tagged calculator, reverse polish notation, RPN, RPN calculator, Scientific Calculator Post navigation If RPN interests you, it’s a subject we’ve looked at in greater detail in the past. All the resources can be found in a GitHub repository, so if RPN is your thing there’s nothing to stop you building one for yourself. The key legends are a set of printable stickers, which when printed on self-adhesive laser film prove durable enough to last. It runs from a CR2032 which is more than can be said for some modern styles of calculator, and it gives the user everything you could wish for in a scientific calculator. This glorious specimen is an open hardware RPN calculator with more than a nod to the venerable Hewlett Packard HP42 in its design.Īt its heart is an STM32L476 low-power ARM processor and a Sharp Memory LCD, all on a PCB clad in a 3D-printed case you’d have been proud to own in the 1980s. Since classic models from the 1970s and ’80s are rather pricey, ’s just build his own called the OpenCalc. Unfortunately for RPN enthusiasts, the RPN calculator is a little on the rare side. Dimensions (Depth X Width x Height mm): 165.5 x 77 × 11.Why reach for a bland, commercially available calculator when you be using a model that employs RPN (Reverse Polish Notation) in its calculations and be a custom build all at the same time? The kids may have colour TFTs and graphing functions, but your keyboard has no equals sign, and that means something. Power Supply Type: T, W, P (with Auxiliary Batteries and Solar Cells) (LR44) -Battery: 1-Battery Life: 2 years Land house investigator test correspondence.
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P (combined use of solar cells and auxiliary battery) (LR44).
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