This first look video shows a simple first try, to combine a small Lego Technic set with a cheap stepper motor and a Raspberry Pi A+.
Prices of components:
Lego 42032: 15 EUR
Stepper motor with controller: 5 EUR
Raspberry Pi A+: 20 EUR (or Pi Zero W for 10 EUR)
Cables, Screws, AC USB: 10 EUR
So you can create for 40 EUR a first small robot!
▶️ DTube
▶️ IPFS