Open-source smart irrigation
Your garden, watered by the weather — not a dumb timer.
Stropi is a controller you build yourself from cheap, common parts. It reads local forecasts and plant-water math to water only when your garden actually needs it. It runs on its own, forever — the cloud just makes it smarter.
The device you built is yours and waters forever.
The cloud only makes it smarter.
The Stropi promise
How it works
Most timers are blind. Stropi pays attention.
A fixed timer waters the same amount whether it's 35°C and bone dry or pouring rain. Stropi watches the forecast and how thirsty each plant actually is — then waters exactly that, and not a drop more.
168 litres this week. The timer watered straight through Thursday's downpour and a damp Friday — money and water down the drain.
96 litres this week — 43% less. Stropi skipped Thursday entirely, eased off Friday, and pushed harder on the hot days. Same healthy garden.
It reads the sky & your soil
Local hourly forecast, recent rainfall, temperature and (optionally) wireless soil-moisture sensors — pulled together every morning.
It does the plant-water math
Evapotranspiration tells Stropi how much water each zone lost today. Rain is subtracted. The result is a precise amount per zone — the formula stays invisible.
It opens just the right valves
At your chosen hour it waters each zone for exactly as long as needed — or tells you plainly why it's skipping tonight.
The daily verdict
One answer:
“What about my garden today?”
Open Stropi and you don't get a dashboard of dials — you get a plain-language verdict. What's happening tonight, per zone, and why. Made for the person who built it and the person who just inherited it.
- Reasons, not just numbers — “12 mm rain covers the lawn.”
- Override in one tap: water now, or not tonight.
- Readable one-handed, in direct sunlight.
What you get when you connect
Build it once. A free account makes it brilliant.
Your controller waters on its own, forever. Connect it to a free Stropi account and the very same device starts reading the weather, answering from your pocket, and quietly saving water all season long.
Watering by the weather
Stropi pulls your local hourly forecast and does the plant-water math, then trims or skips each run — so you never water the garden right before the rain does.
Check in from anywhere
Open the app on the bus and see exactly what's watering tonight, zone by zone. Tap to water now or hold off — from the next room or the next country.
A whole season of history
Every run, every litre, every skip — logged. Watch how much water Stropi quietly saved you, week over week, instead of guessing.
Calm, useful alerts
A possible leak, frost overnight, a clogged emitter, a heatwave on the way — plain-language warnings with a one-tap fix. Signal, never noise.
The daily verdict
One plain answer to “what about my garden today?” — what's happening tonight, per zone, and why. No dashboard of dials to decode.
More zones, more devices
Run several controllers from one account and hand the garden off to family — everyone sees the same simple verdict, no logins to juggle.
No device yet? You don't need an account to build and run one — your controller waters offline on its saved schedule. Connect later, whenever you like.
Build guide
Build it yourself — coming soon.
A box of cheap, common parts, a soldering iron and a 3D printer. We're finishing a guide that takes you from parts to a self-watering garden in an afternoon. Create a free account and you'll get it — with the files and one-click firmware — the day it ships.
Print the enclosure
Two weather-resistant parts you can print at home or order in.
Gather the parts
A short list of common, cheap components — all easy to source.
Wire the valves
Follow one clear diagram from power to standard garden valves.
Flash the firmware
Plug in over USB and flash straight from your browser — no toolchain to install.
Pair & water
Optional: bring it into your dashboard for weather smarts and remote control.
Downloads
Files & firmware — coming soon.
When the build ships, the print files, firmware and a one-click browser flasher all live right inside your free dashboard — kept in step with your device. Create an account and they'll be ready for you on day one.