Keep Every Plant Happy — For Free
iWetMyPlants is an open-source soil moisture monitoring system built around the ESP32. Monitor up to 8 sensors, automate your watering, and connect to Home Assistant — all with hardware you can source for under $20.
What is iWetMyPlants?
A complete, self-hosted plant monitoring network — no cloud, no subscriptions, no ongoing costs. Just open hardware, open firmware, and happy plants.
Soil Moisture
Capacitive sensors that actually last, providing accurate readings without corroding over time.
Wireless Network
Sensors talk to the Hub via ESP-NOW — fast, reliable, and works without your WiFi router.
Home Assistant
Auto-discovers on your network. Your plant data lives in your smart home, where it belongs.
Battery Friendly
Remote sensors use deep sleep between readings — months of runtime on a single charge.
Greenhouse Control
Monitor up to 4 sensors and drive 4 relays for fans, heaters, or pumps with built-in automation.
Under $20
A full 8-sensor hub setup built from readily available components. No proprietary hardware required.
The Story Behind the Project
Brendan — Paramedic, Maker, Reluctant Plant Killer
I'm a paramedic in rural southern Alberta with over two decades of emergency medicine under my belt. I love my garden, I love to tinker, and for years my living room looked less like a lush indoor jungle and more like a houseplant hospice.
So I built something about it. What started as a wild idea turned into hundreds of hours of learning, debugging, swearing at ESP32 chips, and eventually — something that actually works. Something I'm genuinely proud of.
I believe in free and open source software. No subscriptions. No purchase costs. No maintenance fees. Just something people can tinker with, learn from, and make their own. If a few more gardens stay green because of this project, the world is a fractionally better place — and that's worth every late night.
Join the Project
This is a one-person project built alongside a full-time job and a family. Collaborators are genuinely welcome — whether you can write code, test hardware, improve documentation, or just file a clear bug report. Every contribution matters.
Found a Bug?
Bug reports and feedback are the lifeblood of open source. Please keep them coming.
Collaborate
Code, docs, hardware testing — all contributions welcome. Check out the repo and open a PR.
View on GitHubBuy Me a Coffee
Hardware costs money. Hosting costs money. Caffeine costs money. If this helped you, a small contribution goes a long way.
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