In tonight's progress, I did some extra wiring for the EasyDrivers. As it turns out, a few online tutorials suggest tying all the GROUND pins together to synchronize the voltages or something like that. To do this, I chopped up some female pin headers into individual pins that can connect to the three grounds on the EasyDriver. These three grounds include the Raspberry Pi signal ground, the motor power supply ground, and the ground for an optional EasyDriver external power supply. I used this blog post as a reference for what to do.