How the bridge
actually works.
No engineering words, no fluff — just the whole idea explained one step at a time. Read it top to bottom and you'll understand exactly how a wooden bridge can make its own light and catch its own rain water.
The big idea.
A normal bridge just lets you cross from one side to the other. Our bridge does the same job — but it also collects two free things that happen on it every day: people walking, and rain falling.
The walking is turned into electricity, stored in a battery, and used to light the bridge at night. The rain is caught in a gutter, stored in a tank, and used to water the plants nearby. Nothing is wasted.
How a single footstep becomes light at night.
Follow one footstep from start to finish. Each step below is one real stage in the system.
You step on the floor
The walking surface is made of special tiles. When your foot lands, the tile presses down just a few millimetres — so little you can't even feel it.
The tile makes electricity
Inside each tile there is a small generator. That tiny push turns into a tiny burst of electricity — about 5 to 8 watts per step.
The power is cleaned up
Each burst is messy. A small electronic part smooths it into steady 24-volt power, the same kind a battery likes to drink.
It travels to the battery
Two cables run under the deck and collect the power from every tile, then carry it to a safe battery box under the bridge.
The battery stores it
The battery saves up all the energy from the whole day — like a piggy bank, but for electricity instead of coins.
At night, the lights turn on
When it gets dark, the saved energy powers the LED strip in the handrail. The bridge lights its own path — no cable from the school needed.
This isn't science fiction — the same tile technology already powers parts of train stations in London and Tokyo. We simply shrank the idea down to the size of a school bridge. You can see the whole electricity path drawn out on the Energy System page.
How a rain shower fills the water tank.
The bridge is outside, so it gets rained on anyway. Instead of letting the water just drip away, we catch it. Here is the journey of one raindrop.
Rain falls on the bridge
When it rains, water lands on the deck and runs to the edges, the same way it runs off a roof.
A gutter catches it
A long gutter runs along both edges of the bridge and collects all the water before it can drip onto the ground.
A pipe leads it down
At the end, a downpipe guides the water straight down into a storage tank under the bridge.
The tank stores it
A 1,000-litre tank fills up. The clean water can be used to water plants nearby. If it ever overflows, the extra soaks back into the soil.
Tip: in the 3D model on the home page you can switch between “Sunny” and “Rain” to watch both systems in action.
One full day on the bridge.
Things people ask us.
No. The tiles move only a few millimetres — about the thickness of two coins. It feels like a completely normal floor.
Then the battery simply keeps the energy it already saved. The bridge never runs out as long as some people use it during the day.
No, and it isn't meant to. It makes enough to light itself and run a few sensors. The real point is to teach and to waste nothing.
No — it's collected for watering plants, not for drinking. But it saves clean tap water from being used in the garden.
Snow and ice are something we still need to test. It's one of the honest open questions we list on the Project page.
The technology is real and already used elsewhere. Our exact numbers are careful estimates from real product data — see the Project page.