Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Illustration of the feedback strategy on the joystick. Three LEDs placed on the base of the device indicate the existence or absence of a path following error. The arrows indicate how to move the joystick to correct the error. The desired path is shown in green. The achieved path is shown in red.
