Engineering professor Bill Hammack is a well known science and technology documentarian who has been the face of his engineerguy.com project for quite a number of years now.
In this video he explains how it is that a smartphone knows whether it is orientated in landscape or potrait mode – essentially whether it lying on its side or not.
(I’ll give you a hint: it’s because of the accelerometer).
Besides taking us through the concept of the accelerometer, Bill also gives us an idea of just how exactly one of such tiny size is actually created by engineers in the first place!
I think it is absolutely amazing (and mind boggling!) when one starts thinking at the tiny scale engineers need to think and reproduce these inventions at.
Related Link: https://www.youtube.com/watch?v=KZVgKu6v808