Automation System
Light sensors:

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

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Automation System
Pressure sensors:

All of these
use capacitive variations to sense pressure
None of these
use the piezoresistive effect in strain gauge sensors
use an aneroid chamber with a variable resistance output

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Automation System
An operating system:

can help reduce software development time
is useless in most control applications
All of these
None of these
provides ability for other programmers to understand the software structure

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