micropython-ulab is a C library that provides a subset of NumPy and SciPy functionality for MicroPython and CircuitPython on microcontrollers. It implements a multi-dimensional ndarray type with broadcasting, universal functions, linear algebra (Cholesky, eig, inv, QR), FFT, signal processing (sosfilt), numerical integration, optimization, random number generation, and file I/O. The library is designed for performance and memory frugality, using compile-time feature flags (ulab.h) to trim flash usage. Key entry points include ulab.numpy (array creation, math, stats, linalg, fft, io), ulab.scipy (integrate, linalg, optimize, signal, special), and utils (buffer conversion, spectrogram). The architecture is modular with separate C modules for each functional area, a reusable user module for custom extensions, and extensive test coverage for 1Dā4D arrays and complex numbers. The library is actively maintained with frequent releases, but some SciPy functions remain incomplete and the codebase has repetitive dtype-dispatch macros that increase maintenance burden.
This repository is a packaging and distribution hub for Adafruit's CircuitPython library ecosystem. It does not contain application or service code; instead, it aggregates hundreds of individual CircuitPython driver and helper libraries as git submodules, provides build scripts to compile them into a downloadable zip bundle, and manages releases of that bundle. The codebase consists of CI workflows (GitHub Actions), a Sphinx documentation site, shell scripts to update submodules and download bundles, and a single Python script to annotate driver documentation with import names. The actual library logic lives in the linked submodule repositories. This repo is the tool that produces the standard 'Adafruit CircuitPython Bundle' used by CircuitPython board users to get a comprehensive set of libraries. It is well-maintained with automated builds and regular releases, but its own code is minimal and orchestration-focused.