ICT at key stage 3 (Year 9)
Unit 13: Control systems
Section 2: Activity 2
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Objectives |
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- that control systems can be represented diagrammatically
- that algorithms can be tested using state tables
- that inputs and outputs can be defined for each part of the system
- the function and application of counters
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Activities |
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Outcomes |
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Children: |
- Discuss with the class the key points identified in activity 1 and any examples discovered in homework. Review the use of diagrams to represent the system flow and control,
eg a simple diagrammatic structure may suffice, although it is possible to use standard flow diagram symbols or the system used by the software in the school for sense and control.
- Provide an outline structure that all the pupils can work to and then with a large screen or overhead projector (OHP) to support the work, develop the diagram of the ride and its control mechanisms and discuss the inputs and outputs to the system. In this example the system has a number of key sections: a pond with a control gate providing access to the ride; the belt to raise the boat to the top of the system; a control gate to let boats descend by gravity; a sensor to trigger a camera and a sensor to identify when a boat leaves the main section of the ride.
- Discuss and agree the final structure of the system and provide pupils with a system diagram. Ask pupils to work in pairs to begin to specify the modules, inputs, outputs and actions for each part of the system as a state table, which can then be completed for homework.
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- produce a system diagram, and identify inputs and outputs for each part of the system and the principles underlying the process
- test algorithms using appropriate techniques
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Points to note |
- An effective method to support class activity would be to use an OHP or a large screen display to draw the system diagram.
- It may be useful to prepare a pro forma, with correct columns and headings (and a correct system diagram) to help with the development of the state table.
- Homework could be the completion of the state table for the system and a brief description of how one of the sections of the system might work in detail.
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This unit is divided into sections. Each section contains a sequence of
activities with related objectives and outcomes. You can view this unit by
moving through the sections or print/download the whole unit.
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