In order to fully appreciate the science behind this project, it is helpful to understand how it works. Essentially, the main power source that makes this project possible is something called a piezoelectric transducer (I know, its a mouthful). Piezo electric transducers, or piezo elements, are comprised of materials such as crystals and certain ceramics that have a special property which allows them to convert physical energy into AC electricity. Fortunately, we can take advantage of this special property by putting piezo elements underneath our feet in such a way that every time we take a step, we are using our weight to push on the piezo electric elements- which then in turn convert that energy into electricity. The only issue with this, however is that we need DC, not AC in order to power our stuff. We can solve this problem by creating a bridge rectifier with diodes to convert the AC power to DC power we can use.