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I know the guy (well know online) who made these altimeters for the rocketry hobby.

https://flightsketch.com/store/catalog/flightsketch-mini_1/

he went from idea to prototype in 6 months i think. Pretty amazing if you ask me.

Edit: oh i was just looking at the images scroll by and saw a screenshot. I did a rework of the mobile app for him, i totally forgot about that. (i used ionic)

Really common to do it in spare time as an intro to doing it as a consultant. Esp. if you have electronics skills it's not hard to find work. As a "side hustle" though, it's generally about selling a hardware product, a tool, or your skills (SkillaaS).

Embedded is a broad term though, say a bit more about your experience and interests and maybe someone will pop up with pointers.

if you can build a small watch circle like thing that vibrates every 30 mins if you haven't moved it'd be great