A D.C. power supply (10) supplies power for the D.C. motor and the data processing equipment.

The control module accesses AC power and converts the AC power to DC power for powering a DC motor, an integrated circuit, and a microprocessor.

Unregulated D. C. power is distributed from one or more power hubs to the master modules which in turn distribute regulated D. C. power to their associated slave modules.

A power switching circuit for controlling the power from a DC supply to a regenerative load (12).

A power failure is identified when the voltage of the DC power source drops to a certain value (M), even though the power switch (12) is not actuated.

Finally, direct 1- volt operation enables the device to be powered by, for example, a single AA battery.