Measuring resistivity across multiple points without manually rewiring between each measurement — that was the goal.
Channel selection is handled through I/O expanders and multiplexing logic. Contacts are made with pogo pins: repeatable, quick to install, no soldering required. The STM32F030 sequences the measurements, does basic signal processing, and talks to the host over USB-C for both power and data.
A well-designed lab tool: compact, portable, and capable of automating a task that would otherwise be slow and prone to human error.