Solenoid Valve Won't Open in OpenPnP: The 60-Second Fix
· 4 min read
Your solenoid valve won't open. The nozzle has no vacuum. You can't pick up components. Before you spend an hour debugging, check this: the GPIO pin mapping in OpenPnP doesn't match your actual wiring.
That's the answer 80% of the time. Here's the 60-second diagnostic and the full troubleshooting flow.