Automation System
Light sensors:

work in direct sunlight
never use infrared light as light source
cannot be used a s limit switches.
come in a wide variety of mounting styles
None of these

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Automation System
The SKETCHPAD system

None of these
is expensive because it is sophisticated and make demands on the power and resources of the computer.
consisted of an cathode-ray oscilloscope driven by a Lincoln Tx2 computer where by graphical information was displayed on the screen.
is used for interactive Graphics
All of these

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