The robots entering a student design competition must utilize batteries of a specific voltage. As the day progresses, batteries run down and must be replaced by contestants. Periodic manual checking of the batteries must be done by the volunteers; however, this wastes valuable time. Design a standardized unit that the judges can connect to each robot to display battery health continuously. If the voltage is adequate, a green light should appear. If the voltage falls below barely acceptable or inadequate levels, yellow or red lights, respectively, should appear.
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