Keyboard Builders’ Digest / Instruments
c!n tester
Aroum‘s c!n tester is a device designed for testing Professional Micro-like microcontrollers: verifying pin performance earlier than soldering.
KBD.information
Revealed November 12, 2025
Revealed by aroum, the c!n tester is a devoted {hardware} and software program answer designed for automated practical testing of Professional Micro-like microcontrollers. Its major purpose is to offer a quick and dependable technique to confirm primary pin connectivity and performance earlier than deployment.
After lots of tinkering and testing, I’m joyful to announce the official launch of c!n tester — a small however useful device for checking microcontrollers earlier than soldering them into keyboards – aroum2.
Low-cost MCUs generally include lifeless pins, and discovering that after meeting is a nightmare. c!n tester helps forestall that by verifying all pins upfront via a easy GUI.
Options
The tester board makes use of two controllers: a grasp (which runs the checks) and the goal MCU (the one being examined). The whole lot you want – PCB recordsdata, case designs, firmware, app binaries, and full supply code – is offered on GitHub.
The appliance is constructed and examined on Home windows 10/11 and Fedora 41, with macOS assist coming quickly. Documentation remains to be in progress, however the challenge is already fairly usable.
Sources
Revealed on Wed twelfth Nov 2025. Featured in KBD #201 (supply).
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