An off-grid drip-irrigation controller for a garden bed. It clamps to the rim of a 1-5 gallon bucket, and on a schedule (or by conditions) a 5 V peristaltic pump pushes water through a printed 10-outlet distribution manifold out to drip emitters. Solar and battery mean it's sized to run without a wall outlet nearby.
Built to survive outdoors
The electronics sit in a sealed bay with downward-facing cable glands so rain sheds off, and the pump-to-manifold junction plugs positively through the wall with a weep path away from the boards — a wet board on a boosted 5 V rail is the one thing an outdoor controller can't afford. The solar panel stands on its own ground stake and connects by cable, so it faces the sun wherever that is while the controller sits by the bucket.
Honest, coherent power
A single 18650 cell sits at about 3.7 V, so 5 V needs a boost, not a step-down regulator: 6 V solar → TP4056 charger → two 18650s in parallel → a 5 V boost → the ESP32-S3 and pump. Every electronic part is modeled from real vendor or datasheet-built CAD.
What's in the pack
Print-ready STL for all 7 printed parts (including the cross-drilled 10-outlet manifold and the panel stake), editable STEP for each, a wired BOM, an assembly guide, six renders, and a self-contained interactive 3D viewer.