In this article I would like to describe a means of displaying graphically (in real time) intensity of light against he corresponding light-sensor position. The quality and visual effect of the on-screen experimental results make the finished system a potentially very useful teaching/learning aid and as such worth reporting. Moreover the system includes elements of basic physics and electronics, as well as computer interfacing display and analysis; such that it illustrates rather nicely the possibilities for integration of CDT and physics. This process of integration or at least fudging of the boundaries is beginning to happen in many schools (Woolnough et a1 1988). With that in mind I decided to include the specifications which led to our final design in the hope that they might act as a stimulus for a design project. This kind of project would be just as appropriate (at different levels of complexity) for students studying GCSE as for those embarked on a degree course.
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