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.
Best Low-Power Boards for Battery Projects: What to Buy in 2026
Picking the best low-power boards for battery projects sounds simple…
Home Assistant Infrared: How to Control TVs, Air Conditioners, and Other IR Devices
Infrared feels like old tech, but that is exactly why…
Best Zigbee Dongle for Home Assistant in 2026
If you are building out a smart home with Home…
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.
