Free starter pack
Build a battery-powered Home Assistant sensor that lasts months on one charge
Tested ESPHome configs, 3D-printable enclosures and a wiring cheat sheet — the things we wished existed when we started.
What you get
- Tested ESPHome YAML configs Deep sleep and battery fuel-gauge, the two things that decide whether a sensor lasts a week or a season.
- Printable STL enclosures Sized around the Sprig-C3 and its expansions, printable without supports.
- One-page wiring cheat sheet Pinouts and the mistakes worth not repeating, on a single sheet you can keep by the bench.
- Short PDF setup guide From flashing the board to seeing it appear in Home Assistant.
Open source · Ships from the EU · As featured on CNX Software and Hackster.io