After disassembling a robot that was made by students of a previous year, we made Gizmo with the very basics. We used no sensors for this lab and relied on changing how much power is going to the motors to achieve a result.
The First actual part of the lab was for the Robot to go in a straight line. Because of the lack of sensors, the robot could only roughly go in a straight line and would often veer into another direction. The college floor is also to blame for contributing to make the robot veer however.
The Second part of the lab was to make the Robot turn 90 degrees. The instructor wanted us to achieve this by using open loop control (timed maneuver without any feedback). Gizmo ended up sometimes doing proper 90 degree turns and sometimes over/under-shot it's turns. All in all, Gizmo was able to turn well enough without using any sensors.
The Third part of the lab was to simply refine the driving and turning functions of Gizmo. The functions included turning left/right, as well as moving forward and backwards. As predicted, because of the lack of sensors, Gizmo was not completely perfect yet it still yielded satisfactory results.