This article describes work around an automated cable harness test bench, focused on scalable I/O acquisition, real-time detection, and operator-facing display.
The system is built on a Raspberry Pi 4, used to run the user interface and manage test execution. A local HMI guides the operator, displays connection status, and reports pass/fail results during testing.
A large number of lines are monitored using I/O expanders, allowing many connections to be checked in parallel. Test logic identifies common wiring issues such as opens, shorts, swapped lines, or inverted connections, with results updated on-screen in real time.
Overall, the design centers on reliable multi-channel continuity checking with clear visual feedback and a workflow-oriented interface.