sending data

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classroom lights out to darken the room, an on-line metronome.

Give a torch to one pupil and set them far apart. The rest of the class will be asked to decode the message as well. The aim is to transmit a character successfully from pupil A to B (use Unicode or subset ASCII) At every metronome beat the torch is either on or off. For example, if the pattern “111” was to be transmitted the torch can stay on for 3 beats. This activity also illustrates the need for a computer to have a clock – was that one one? or five ones?!!

This could be done by all pupils in pairs using a paper copy of a light/touch that they hold up to partner or face down at each beat to transmit some data. The metronome represents a computers clock.

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