Someone vibe coded an irrigation valve with Claude Code that waters plants only when the soil is actually dry, not on a fixed schedule. A moisture sensor checks the dirt, opens the valve when it drops below your threshold and shuts off when moisture rises. → A motor-driven pinch valve squeezes a flexible tube so no moving part ever touches the water → Works at zero bar pressure so a rain barrel is enough, no pump needed → Handles dirty water, algae and liquid fertilizer → Bistable design needs no power to hold open or closed → Runs 3 months on a single 9V battery → Every custom part prints on a standard 3D printer with half-inch BSPP threads Fully open source with 3D models, PCB files, bill of materials and firmware included.