After making a recipe a few times, I internalize the process pretty well, but I can’t remember the numbers involved, so I built a kitchen scale to do that for me.
You can get the board design files, case design files, and firmware source from its Github repo.
It shows a progress bar as you’re adding an ingredient—really useful for pacing how quickly I add an ingredient so as to not add too much.
It’s built on top of an OXO pull-out display kitchen scale, allowing the custom-designed portion to be limited in scope.
The case was designed in OpenSCAD and printed in PLA.
The original intention was for the scale to be completely controlled by your phone (no display or buttons or anything), but I found that I didn’t like always having to have my phone around, so I targeted this as at least the MVP.