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OCR Cambridge Nationals in
ICT(Level 1/2)
R010Developing Control Systems
Computer control is used in many different areas.
Control systemsControl systems
Automatic garden sprinklers…Windows that automatically open when the sun shines……and robot workers in car factories, are all examples of
control systems at work.
Weather systems are used to predict storms, tornados and earthquakes.
Weather systemsWeather systems
They also help people to know when the best time is to irrigate land,
spray pesticide or gather crops.
They monitor air temperature, humidity, wind speed and
direction, solar radiation, rainfall and soil temperature.
Heating systems are controlled by thermostats that turn the heating up or down depending on the temperature.
Heating systemsHeating systems
They can be set to come on and go off at specific times and are often used to maintain a
constant rate of heat.
These are found in homes, factories and greenhouses.
Many businesses and homes have burglar alarms that go off if a magnet switch is broken, a
window is opened or an infrared beam is broken.
Alarm systemsAlarm systems
Control systems like this can be programmed to react to
sensors and know what to do when the sensor is triggered.
Traffic lights are a prime example of a set of repeating control sequences
that work on a loop.
SequencesSequences
Sensors detect motion or, in the case of a crossing, a button is
pressed that starts the sequence of events to ensure the traffic lights
work as they should.
Control programs are often viewed as flowcharts so it is
easy to see the starts, stops and sequences.
FlowchartsFlowcharts
It is easy to ask questions and see the answers in a
flowchart diagram.
You may have used a flowchart creator program
and seen this at work.
Writing control programs involves:
•logging any changes
•testing the finished article
•and ensuring the system works as it should.
TestingTesting
The last thing you want is a greenhouse full of plants dying or traffic accidents caused by
poorly controlled lights.
You will learn…You will learn…
How to write control programs.How to test a control program.How to create flowcharts.How to plan and create a control program.
What control systems are used for.
How control programs work.
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