Life & fun · February 17, 2023
I built a custom USB Trackball
In plain words
This is a custom USB trackball built by an individual maker. It connects to computers via USB for pointing device control. The project showcases a hands-on approach to input device design, appealing to enthusiasts interested in custom hardware, ergonomic tools, or DIY electronics projects. The creator shares technical details and design choices on their website for those curious about the build process and specifications.
written from the facts on this page · September 2026
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Life & fun · 26d ago · everycube.alen.is
Hi HN, I built Eigendrum, a web tool that solves the 2D wave equation for arbitrary shapes so you can hear what they sound like as drums. How it works: * Solves -∇²u = λu using finite element analysis (Kφ = λMφ) on a triangle mesh. * Validated to <0.1% error against closed-form solutions for circles (Bessel zeros) and rectangles. * Sound model factors in strike location, Rayleigh damping, and mallet width. * Includes Kac drums I & II to demonstrate identical sound spectra from different geometries. * No frameworks, build steps, or dependencies. Repo and tests:…
Life & fun · 26d ago · baselashraf81.github.io
