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.
MeshCore vs Meshtastic: Which LoRa Mesh Platform Is Better for Real-World Use?
MeshCore and Meshtastic are both LoRa-based mesh communication projects, but…
The Best Mini PC for Home Assistant in 2026
Finding the best mini PC for Home Assistant is not…
CN3791 MPPT Solar Li-ion/LiPo Charging Boards: what they are and how to use them safely
Quick Summary A CN3791 MPPT board is a small module…
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.