But today we can use the good stuff that, until recently, was only available to military: radar. In this post we will discuss how radar works, commercially available small radar devices, and where to learn more to help make it easy to add radar to your next project.

via Guest Post: Try Radar for Your Next Project.

There are several different types of RADAR explained: Continuous Wave (CW) Doppler, Impulse, Frequency Modulated Continuous Wave (FMCW).

Most important bits you can get for around $10,-.