- Explain to the class that they are going to make a house security system with a floodlight and house lights that come on after dark and go off in the morning, a window alarm based on a magnetic switch, a door alarm based on a pressure pad and a burglar alarm with a loud buzzer and flashing lights.
- Ask the children to work in groups to build a model of a house with a variety of input and output devices attached. This could just be the front facade, built out of cardboard or other material. The house will need a floodlight and light sensor outside and lights at one or more windows inside. The front door will need a pressure pad under the door mat and the window will need a magnetic switch. Both door and window will need to open. There should be a coloured light and buzzer on the front of the house marked 'alarm'.
- Ask each group to write a sequence of instructions to switch lights on at night and off in the morning and for the alarms to sound if the door or window is opened. They should write separate sequences for each event, not try to combine them all. Ask them to record their programs, draw and annotate a diagram and describe the results.
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- use input and output devices and produce a simple set of instructions linking causes and effects
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