https://pgil256.github.io/blog/tags/testing/Recent content in Testing on Gilhooley Developer BlogHugoen-usPatrick GilhooleyThu, 23 Apr 2026 10:00:00 -0500https://pgil256.github.io/blog/posts/kneespa-drx/Thu, 23 Apr 2026 10:00:00 -0500https://pgil256.github.io/blog/posts/kneespa-drx/<p>The Kneespa DRx is a knee decompression machine. A Pi runs a PyQt5 touchscreen app, the app talks to an Arduino over serial at <code>/dev/serial0</code>, and the Arduino runs three actuators (axial, horizontal, and lateral) that press against somebody&rsquo;s knee. There&rsquo;s a pressure cap hard-coded at 80 lbs and a physical e-stop button, and I thought about both of them constantly.</p>