great video about "piezoelectric energy harvesting" (introduction, examples, principle)

this video provide about introduction of piezoelectric crystals.


0:30
- you could see the dance floor using piezoelectric crystals.
- It could generate an electricity while you dance. It's not enough to light whole city, but It could power the dance floor light.


0:42
- a tire and pace maker
※ pace maker is a device that is placed inside someone's body in order to help their heart beat in the right way.


1:10
- One big problem about piezoelectric crystals.


1:30
- how to generate by using piezoelectric crystals. (the principle)