Automation System
Stepping motors:

can run both clockwise and counterclockwise
can be built to index different amounts by changing the pole configuration
can run at varying speeds
All of these
do not require commutators

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Automation System
Pressure sensors:

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

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