After a second revision, I have completed the power board for the Mecanumbot. This board has the following features:
- automatically selects between two batteries and the wall
- chooses the wall if available, otherwise drains the batteries one at a time
- provides power voltage and current measuring via ATmega168 running the Arduino bootloader
- communicates to the primary vehicle Arduino over I2C
- provides regulated 5V power for the robot LEDs
