The power supply distributes power to all of the components and subsystems on the robot. For our power source we chose to use a 3-cell lithium polymer (LiPo) battery, which has a nominal voltage of 11.1V but that actually operates around 12V on a full charge.
To obtain the 3V3 and 5V0 power supply rails needed to power many of the components on the robot, we designed a board that uses two linear voltage regulators to output these voltages. The board also distributes the 12V power supply and provides a common ground for all components on the robot.
The board also includes power indicator LEDs, filtering capacitors, a fuse for safety, and a power switch for turning the robot on and off. The schematic for the board and a photo of the finished board and battery mounted on the robot are shown below.