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OCR Cambridge Nationals in ICT (Level 1/2) R 010 Developing Control Systems
Control systems Computer control is used in many different areas. …and robot workers in car factories, are all examples of Windows that Automatic automatically opensprinklers… garden control systems atwhen work. the sun shines…
Weather systems are used to predict storms, tornados and earthquakes. 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. These are found in homes, factories and greenhouses. They can be set to come on and go off at specific times and are often used to maintain a constant rate of heat.
Alarm systems 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. Control systems like this can be programmed to react to sensors and know what to do when the sensor is triggered.
Sequences Traffic lights are a prime example of a set of repeating control sequences that work on a loop. 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.
Flowcharts Control programs are often viewed as flowcharts so it is easy to see the starts, stops and sequences. 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.
Testing Writing control programs involves: • logging any changes • testing the finished article • and ensuring the system works as it should. The last thing you want is a greenhouse full of plants dying or traffic accidents caused by poorly controlled lights.
You will learn… What control systems are used How to to write test acontrol flowcharts. program. How control programs work. How tocreate plan and create a controlfor. program.
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