Conifirming somthing

[Culvan Van Li]

It's true that the black wire is often called ground. It's a frequent mistake. Technically ground is into the earth. Most mobile robots don't have an electrical connection to the earth.

Anyhow there are lots of terms for it. Common and signal return are both accurate. People will usually understand ground and get the right idea, but the term is not really accurate for this application.

Andy