Here is a tutorial on interfacing the HC-SR04 range finder. This is a low cost US$4 - 6. accurate device. I was able to get better than .5% accuracy.
Joined: Wed. Dec 29, 2010
Posts: 423 View posts
Location: Saipan, Northern Mariana Islands, USA
Last Edited: Tue. Sep 25, 2012 - 12:17 PM