We show an experimental setup based on a popular LEGO Mindstorms set, allowing us to both observe
and investigate the parametric resonance phenomenon. The presented method is simple but covers a
variety of student activities like embedded software development, conducting measurements, data
collection and analysis. It may be used during science shows, as part of student projects and to
illustrate the parametric resonance in mechanics or even quantum physics, during lectures or
classes. The parametrically driven LEGO pendulum gains energy in a spectacular way, increasing its
amplitude from 10° to about 100° within a few tens of seconds. We provide also a short description
of a wireless absolute orientation sensor that may be used in quantitative analysis of driven or
free pendulum movement.