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Michael Jurasovic's Weblog

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A Very (!) Early Play With Astral's Red Knot Static Type Checker

This is a casual look at a WIP piece of software that I know nothing about - don't draw too many conclusions from this. Astral is doing The Lord's work with python tooling. Ruff is a joy to use for both formatting and linting. And the newer uv has breathed fresh …

Picking Resistors for Parallel and Series Equivalence

I came across an interesting question on stack overflow that I couldn't help answering . The question asks how to determine which resistors from a given pool have an equivalent parallel resistance as close as possible to some target. This jumped out at me as a fun little combinatorial problem to …

Automatic Differentiation for Power System Analysis

This notebook calculates marginal loss factors of a power system using automatic differentiation. The marginal loss factor (MLF) at a connection node is defined as the rate of change of system generation at the reference node with respect to the change in load at the connection node. The reference node …

Multilateration in 2D: IoT/LoRaWAN Mass Surveillance

" Multilateration (MLAT) is a surveillance technique based on the measurement of the difference in distance to two stations at known locations by broadcast signals at known times. " - en.wikipedia.org/wiki/Multilateration Abstract A single motivated individual with several hundred USD and a hobbyist level of competency in electronics and …