Automation System
Sensors:

None of these
are not important in automation
will be much smarter and more sophisticated in the future
are easily developed
probably will not improve over the next decade

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Automation System
Digital signals:

have a sinusoidal shape.
have a frequency measured in units of hertz
are assigned values of 1 or 0 depending on the voltage level
None of these
can have three possible levels

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