controller
Quick Summary
A controller is a mechanism used to adjust the operation of a device, machine, or system. In technology, control systems are fundamental to automation, ensuring that variables conform to a set standard or vary in a specific way. These systems can be operated by electricity, mechanical means, or fluid pressure.123
Early examples of control systems include the Jacquard loom, which used punched cards for programming, and Roman engineers' use of floating valves to maintain water levels. James Watt's flyball governor, designed to regulate steam engine speed, is a famous example from the Industrial Revolution.3
Modern control systems often involve microprocessors, especially in consumer products like microwave ovens, washing machines, and automobiles, where they manage functions such as timing, power levels, and engine control. Within a computer's central processing unit (CPU), a control unit fetches and translates instructions from memory into signals that direct the computer's operations.45
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