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Unit 24: Controlling Systems Using IT - overview

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alison earnshaw

on 15 January 2014

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Transcript of Unit 24: Controlling Systems Using IT - overview

What is a control system?
A control system is a device, or set of devices, that manages, commands, directs or regulates the behaviour of other device(s) or system(s)
So - examples might include?
the autofocus (and auto exposure)
on your camera

Touching the area on the screen
starts the process of the camera
altering it's focal length to make
your selection be the part of the
image in focus
So - examples might include?
Truck smart suspension

this adjusts on the move when there is an uneven load to maintain
the level of the truck and a smooth ride as it passes over uneven ground and while cornering
So - examples might include?
A washing machine
Unit 24: Controlling
Systems Using IT

when you press the shutter button, a transducer on the front of the camera send pulses of infrared light towards the subject. The IR pulse is reflected back and the transducer picks them up.

For each metre of round trip it takes about 6 ms. The time difference between output and input is detected and fed to the microprocessor, rotating the lens housing to focus appropriately.

It works for up to about 10m then the setting is moved to an infinity setting
How does it work?
This is a good illustration of the use of microcontrollers in a control system.

The system will control the washing cycle, pumps, motor and water temperature
Other examples of embedded systems?
camcorders, cell phones, DVD players, electronic card readers, photocopiers, printers, scanners, TVs, temperature controllers etc
A control system can be thought of as a system which can be used to:
Control some variable to some particular value
eg a central heating system where the temperature is controlled to 21 degrees
control the sequence of events
eg a washing machine where the dials are set to eg 40 degrees and the machine is then controlled to a particular washing cycle
control whether an event occurs or not
eg a safety lock on a machine where it cannot be operated until a guard is in position
What is the difference between a home computer sytem and a control system then?
A home computer is multi purpose and may undertake a variety of tasks.

A control system may only need to perform one or a few simple tasks and can be, therefore, much less sophisticated technically in terms of speed memory and so on
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