Mole Mini is a chemistry-themed educational tool created in 2025 by Connor Denihan and Paul Savvas for the Great Mills High School STEM Academy’s Mole Day celebration. Designed to combine both hardware and software in a compact, accessible format, Mole Mini runs a custom operating system called Mole OS and is built around a Raspberry Pi Zero 2W encased in a fully custom 3D-printed shell. The project was created to promote hands-on STEM learning and is fully open-source, with both the hardware files and software code available to the public.

Mole OS features a suite of powerful chemistry tools aimed at students and educators. These include a Chemical Equation Balancer, a Mole Calculator, and two physics-oriented calculators—one for frequency and wavelength, and another for photon energy and Planck’s constant. Each tool is designed to deliver fast, accurate results in a clean, intuitive interface. The full source code is hosted on GitHub, making it easy for others to explore, adapt, or improve.

The hardware side is equally accessible. Mole Mini uses readily available components—such as the Raspberry Pi Zero 2W, basic adapters, and a micro USB charging cable—housed in a 3D-printed case that can be fabricated using most desktop printers. The case files are freely available on Thingiverse, and the complete parts list is publicly documented. Whether for classroom demos, personal experiments, or Mole Day celebrations, Mole Mini brings chemistry to life through thoughtful design and open collaboration.

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