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The 30 hobbies closest to electronics & Arduino in what you actually do and how it feels. Each one says what's alike and what's different.
Build and program machines that sense their surroundings and move on their own.
Alike: Both hands-on and creative.
Different: More social. Less about being useful.
The closest are Robotics, CNC & laser cutting, 3D printing, Home automation and PC building. They're alike in what you do and how it feels.
CNC & laser cutting is close to electronics & Arduino and quicker to pick up.
Coding side projects is close to electronics & Arduino and costs less to start.