![]() ![]() Imagine if these had ZigBee and could be sold directly with smart bulb kits! I think walkie talkies are probably one of them, imagine FRS over ZigBee with multi-week standby battery life! Or magneting one to the fridge as a dedicated kitchen timer/barbecue thermometer receiver. There’s a lot of miscellaneous stuff that doesn’t quite belong in a phone that could be rolled into calculators. 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. The TI-30X IIS is also available in pink and blue.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. ![]() The calculator is ideal for general math, pre-algebra, algebra 1 and 2, geometry, statistics, and general science. A snap-on cover fits on the back of the device or can be slid over the front of the calculator to protect it when not in use. The calculator uses solar power and internal battery as a backup source just in case there’s not enough light. Or, use the entry line scrolling feature to review previous entries so you can look for patterns within answers or simply retrieve answers to previous calculations. Make a mistake? Use the arrow keys to scroll through the original equation to recalculate the answer. The calculator is capable of performing operations with both fractions and mixed numbers - you can enter fractions exactly as they appear in the textbook, no conversions necessary. The two-line display shows both entry and calculated results at the same time. The Texas Instruments TI-30X IIS Scientific Calculator is versatile and reasonably priced. ![]()
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