TL,DR:

hellen-one is a toolset to produce custom PCBs by merging gerber files of known proven functional modules into trivial frame PCB with mostly just the main vehicle connector. Gerber export and gerber merging happens in the cloud, i.e. on the github server.

Step 1: fork https://github.com/rusefi/hellen-example/ repo to get github actions and meta files learn about forking

Step 2: make sure github actions are enabled/enable github actions on your fork

Step 3: replace xxx and yyy in revision.txt with name of your board. By the way we expect kicad files to be placed in the root folder of the repository.

Step 4: create youboard.kicad_pcb from proven modules using KiCAD

Step 5: push into github to trigger hellen-one gerber expert and gerber merge (that's where the hellen magic happens! for instance gerber export is taken care by export.sh script which github action would invoke automatically. Just watch for the yellow circle to turn into a green checkmark.)

Step 6: (sorry rotation only by factor of 90 degrees at this point)

Step 7: order your using fabrication files from 'boards' folder!

Please see how some of the open source boards are done and follow the pattern:

Open Source Boards

This repository contains all scripts and data to create Hellen One boards for rusEFI!

Hellen One is a DIY PnP ECU board construction toolset.

Do you have a car with a rare or non-standard ECU connector pinout? Do you want a custom DIY ECU but don't want to design it from scratch?

Then Hellen One is for you!

Please see Hellen One Wiki for more info:

https://github.com/andreika-git/hellen-one/wiki

FAQ

Q: I do not have any files inside hellen-one folder on my PC

A: That's a problem, you have not cloned submodules. See https://stackoverflow.com/questions/3796927/how-do-i-git-clone-a-repo-including-its-submodules