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Two main components of a robot requires electrical power: the motors and
the brain. Although motors are rated at certain voltages, such
recommendations are often lose. This means using 13.2V on a stepper motor
rated for 12V is unlikely to be any problem. The brain (logic) component,
however, is not as flexible. If a logic component is rated at 5V, you
cannot feed it 6V or 4V.