起因需要使用 Piezo 做一些设计
http://www.te.com.cn/chn-zh/videos/transportation/piezo-film-and-energy-harvesting-theory-and-applications.html
相关 TE 长条的传感器资料:TODO
http://www.piezofilms.com/applications.html
找到这篇文章,压电片测心跳: https://hackaday.com/2015/03/19/measuring-heart-rate-with-a-piezo/