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Abraham Bagherjeiran

First-time hardware designer building tactile tools. Creator of StackCalc.

Palo Alto, CA
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abraham-bagherjeiran
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This user joined on 09/14/2026.

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A screwless printed RPN calculator: apps ship, firmware runs in an RP2350 emulator, and the board is in fabrication.
Project Owner Contributor

StackCalc32: A Tactile RPN Calculator

abraham-bagherjeiranAbraham Bagherjeiran

21.2k
149
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Freedom at your fingertip.
Project Owner Contributor

PolyKybd (Displays In Your Keycaps)

thpollthpoll

18.5k
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Open-source and open-hardware custom scientific RPN calculator
Project Owner Contributor

OpenRPNCalc

anton-poluektovAnton Poluektov

18k
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An ARM based scientific calculator
Project Owner Contributor

Scientific Calculator

ramn-calvoRamón Calvo

9.3k
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It is a python handheld computer with a complete keyboard and a symbolic math engine inside it.
Project Owner Contributor

Galdeano handheld computer

angel-cabelloAngel Cabello

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An emulator for the HP Voyager calculator series
Project Owner Contributor

HP15C Calculator Emulator

alxgarzaalxgarza

3.7k
1.4k
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DIY floating-point calculator based on AVR ATmega328P MCU and written in pure assembly
Project Owner Contributor

Hardware Calculator From Scratch

igor240340igor.240340

3.7k
48
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Combines a PocketType keyboard and reflective displays in a prototype PDA - usable in bright sunlight to write its own software.
Project Owner Contributor

Pocket Pad

jefmerjefmer

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14
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Featuring USB-C!
Project Owner Contributor

HP Woodstock LiPo Battery Pack

cyulCYUL

2.8k
20
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The AriCalculator is a DIY calculator or a general purpose handheld device.
Project Owner Contributor

AriCalculator - A homemade handheld calculator

373876178373876178

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A small pocket calculator for programmers and engineers, a mix between HP-42 and HP-16. Fully programmable in Forth.
Project Owner Contributor

4TH Calculator

peterPeter

2.1k
58
3
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A small Handheld PC with a physical 56 key keyboard, 4inch Display and Expansion header for add-on boards (Like Arduino Shield).
Project Owner Contributor

mutantC V4 - Easy to Build, Modular Handheld PC

rahmanshaberrahmanshaber

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1.1k
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TRICORDUINO - 4.0 _ Scientific Tricorder with Arduino technology
Project Owner Contributor

In search of a real Tricorder

antonio-cesar-de-oliveiraAntonio Cesar de Oliveira

1.9k
562
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Exploration of calculators, their emulation, mechanical aspects such as pretty buttons and quirky displays
Project Owner Contributor

Calculators

svofskisvofski

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A simple user friendly RPN calculator for day to day calculations. Includes a mechanical keybord, date/time and count down/up clock
Project Owner Contributor

Retro RPN Desktop Calculator

jeroen-brinkmanJeroen Brinkman

1.4k
17
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A business card-sized calculator for developers
Project Owner Contributor

HexCalc

tyler-kleinTyler Klein

832
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Using a CortexM0 to build a calculator similar to the Sinclair Scientific Calculator.
Project Owner Contributor

RPN Scientific Calculator

santiagoSantiago

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The surplused (eBay) device contains a microcontroller, a keyboard, and a mono graphic screen and screams to be hacked!
Project Owner Contributor

RPN Integer Calculator from Smart Response PE

ray-burneRay Burne

310
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An RPN Graphing Calculator
Project Owner Contributor

RPN-83

timm-murrayTimm Murray

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