So today I sat down and slapped together what I am referring to as a "volume board." Really, there is no sound involved with this project yet, so it's not much of a volume board. However, what the project does do is display a very simple digital output based on an analog input signal, or, an electrical "volume." Hence the name.
I put together this project because I needed some practice in dealing with analog signals as inputs to my microcontrollers. Hence, I did some browsing on LadyAda.net and Sheepdog Guides and found this and this tutorial respectively. Both of these guides discuss safe ways of hooking LEDs up to Arduino's 5V power output pin. They also touch on the Analog input pins. The Sheepdog tutorial gave me the idea to use a potentiometer to control an analog signal to my Arduino board in order to light up certain LEDs. Thus, I mostly ripped off that design and modified it for my own purposes. Since my primary goal was to learn about Arduino analog signals, I did not feel it necessary to design an entire concept by myself. So, without further ado, I'll explain a bit more about what I did and how I did it.