Timing Pulley 2GT 18x5mm 20 Teeth rob0114 Keep the controller ground and

Keep the controller ground and motor-driver ground common

SiLabs chips seem to have better driver stability and can handle very high speeds and 'unusual' non-standard baud rates

16–32 GB Class-10 microSD works well for Raspberry Pi OS and typical apps

Yes—the 40-pin GPIO

Ethernet cable - required if you want to connect your Pi to the Internet via a router

Timing Pulley 2GT 18x5mm 20 Teeth rob0114 Keep the controller ground andMechanical Motion Parts for Better Fit, Drive, and Alignment The Timing Pulley 2GT 18x5mm 20 Teeth is a practical motion hardware from Circuitrocks for students, makers, and repair friendly builds. It fits well in projects that need mechanical fit and mounting, while keeping setup straightforward for testing and prototype work. Compared with generic parts, this product stands out through details such as 20 Teeth, 18x5mm. That makes it a solid choice