This is a simple joystick module. The joy stick returns to it's middle position, on both axis, when you don't held it in place, for good and bad. Both the X and the Y axis have a range control setting the output volt between 2V and 10V, as well as an offset moving the voltage between the negative side and the positive side.
Unfortunately there are no building instructions for this module, but at least you'll find the schematic, some photos, and some comments.
The finished module.
That's it! Have fun and make some strange voltages!