Wanted to teach my little brother about logic gates. Saw that for him to truly grasp the idea of it, he needed some "hands on" experience to develop the intuition about it. I decided to develop a PCB board that basically turns-on-off the lights based on the inputs. He was like "cool" and kind of threw it in the corner. Rather than just leave it, I decided to further develop it and make it as a learning tool for myself as well(web design, marketing, BOM optimization etc).

Then I started to get feedback on the initial project which was quite helpful(universities, EEVBlog and colleagues) and based on that made a "Logic Trainer" which is like very advanced version of the initial idea. It has so many features and it kind of has taken off in a sense that 2 universities want to buy it for themselves. Also I didn't expect it but most people who buy it do it for their kids. IMHO its way too complicated for kids, but practice and feedback that I have gotten shows that it really isn't. I haven't made any profits from the project yet (due to high development cost) but hopefully in the future it help to pay my rent :).

Check out the website at https://logicgat.es