Signal processing experiments with the LEGO MINDSTORMS NXT kit for use in signals and systems courses

This paper presents a set of inexpensive signal processing experiments that can be used as projects or hands-on demos to supplement signals and systems courses. Signals and systems concepts tend to be very mathematical and abstract, and students who prefer more practical material are at a disadvantage in these courses. The experiments are performed on the LEGO MINDSTORMS NXT platform, which is portable, relatively inexpensive, and rugged enough so that students can perform the experiments at home or in the classroom. Experiments introduced in this paper highlight fundamental concepts such as sampling, aliasing, digital filtering, frequency analysis, system identification, and control design. Projects, programs, and additional hints for instructors are posted on a website for free use.