DIY Electronics, Smart Projects, and Real-World Builds
J-Rat Techworks
I build practical, real-life projects using ESP32 boards, sensors, 3D printing, FreeCAD, Home Assistant, and whatever else I can get my hands on.
This site brings everything together in one place – code, wiring diagrams, parts lists, downloads, and full write-ups to make each project easier to follow.
Have a build you want to show off?
Send it through and I’ll feature my favourites on the site.
Top 10 IoT Projects for Beginners (That You Can Actually Build)
If you’re new to IoT, it’s easy to get stuck…
Matter Cameras Are Finally Here, and SmartThings Is First to Make Them Useful
How the Matter 1.5 update and Samsung’s move shift the…
Shelly launches a new wall display and control panel, with Home Assistant users firmly in mind
Shelly has announced a new wall-mounted smart display and control…
What You’ll Find Here
Step-by-Step Project Guides
Each project includes diagrams, code, troubleshooting notes, and all the parts you need. Every YouTube video has a matching page here.
Recommended Tools & Parts
The hardware and components I use the most, tested across real builds, not just listed for the sake of it.
Downloads & Files
STL files, PCB Gerbers, ESPHome YAMLs, Arduino sketches, and anything else used in my builds.
Behind-the-Scenes Notes
What worked, what didn’t, and the lessons learned while testing and breaking things along the way.