Here's how you'll wire up the board. It's simple, really, it just needs to be repeated a bunch of times!
To read a potentiometer, we'll connect the left leg to ground and the right leg to 3.3V. The middle leg is connected to the pot's wiper, which is a variable resistor. The entire arrangement acts as a variable voltage divider.
By connecting the middle leg to an analog input pin on the Grand Central, we can read the varying voltage level.
First add a potentiometer to the breadboard with the legs at the bottom of the switch.
Wire a black jumper from the left leg to ground.
Wire a red jumper from the right leg to power.
This leaves the center leg to be wired to the an analog input on the Grand central.
Repeat this for a total of eight pots on the top half of the breadboard.
Now, you can wire the center legs of each pot to the first eight analog inputs on the Grand Central. You will also run a black wire from the breadboard ground rail to Grand Central GND pin and a red wire from breadboard power rail to Grand Central 3.3V pin. Do not use 5V!
Be sure to jumper the ground and power rails on the lower half of the breadboard to their respective rails on the top half, then add the other eight pots as shown here.
You're ready now to prep the board and code it for use!
For a more advanced build, you can go beyond the breadboard and onto a Perma Proto board, or even a MEGA Shield as seen here!