this post was submitted on 12 Nov 2023
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Sounds like your hobby could turn into something more. Electronics can have some really unintuitive debug issues. Your idea for a lego sorter reminds me of parts Shane's (Stuff Made Here) puzzle robot. https://www.youtube.com/watch?v=Gu_1S77XkiM
I haven't done any modelling myself, but if I ever start, I'll probably try openscad. Lego are fairly uniform, so I would wonder if more traditional machine vision techniques would work.
I have basically no experience with any machine vision, I've done some edge/color detection once, but my intuition says that sounds like a plan. Because you have a pretty unique feature for each brick, its number of studs and size of cavity on the bottom, you might not need as full a picture of each brick as you might think. That's pure speculation though. Have fun with the project.