The Idea
A digital water curtain turns a waterfall into a display: by opening and closing a row of valves with precise timing, gaps form in the falling sheet of water and combine into letters, logos, or figures. The product is aimed at event venues, restaurants, flagship stores, and public spaces — environments where a moment of surprise is worth real money.
Why It Is Harder Than It Looks
The image is created in fall time, not on a screen. A valve opens at the top, and the gap it creates only reaches the viewer's eye level a few tenths of a second later — and every pixel row in the image has a different delay. That means the controller has to "draw" the image inverted in time: the bottom row is sent first. The calculation depends on installation height and flow speed, so it is a calibration parameter, not a hard-coded constant.
The second challenge is valve response time. A slow valve blurs the edges and smears the picture. This was the decision that set the quality of the whole product — we selected an array of fast valves whose opening time is far shorter than the pixel time, even at the price of a more expensive component.
Development Scope
- Mechanics and hydraulics: a manifold that delivers uniform pressure along the entire row — a pressure difference between the ends means letters of different thickness. Core mechanical engineering work.
- Electronics: driving a large valve array in parallel with precise timing — see electronics development.
- Embedded software: converting an image or text into a time-sequenced command stream, including fall-time compensation — see embedded software.
- Operator software: an interface where staff type text or upload a logo without understanding the system underneath.
- Wet-environment design: sealing, corrosion prevention, and stopping mineral scale from clogging nozzles over time.
The Failure Mode That Took the Most Work
Scale. A system that runs on water for months accumulates minerals, and the first clogged nozzle becomes a permanently dead pixel. The fix combined nozzle geometry that reduces buildup with genuine serviceability — every nozzle row can be removed and cleaned without dismantling the machine. Not just "it works," but "it keeps working."
In Summary
This project is a showcase of a product where the visual experience is the entire value and all the engineering is hidden from the viewer — the kind of mechatronic challenge we love taking from idea to product.
Dreaming up a showpiece product of your own? Contact the Projects House team and let's engineer the magic.
Photos from the project
