Hello, my name is Gavin Rauh, I was wondering if I could get some help on a project that I want to make. I want to make a speed tracking gun/radar gun, but I don't know where to start. I was thinking maybe I could use ultrasonic sensors and determine the time it takes to go the distance between the 2 and then display it on an lcd screen. However, my goal is to measure the speed of a thrown baseball, and i would have to probably throw the baseball pretty accurately for this idea. I'm a beginner to arduino too, and I don't really know where to begin. Anyone have some guidance for me?
Hi，I’m a beginner too ， in you case i think you need Doppler radar not ultrasonic sensors.
this is link from youtube，Arduino Radar with Big display - YouTube
I hope this can help you。
Hi,
If you google
diy speed radar arduino
Think you will be presented with quite a few ways to accomplish your project.
Tom... 
