Some of you may remember my Vex Robotics Ultrasonic Bot series.
Here is a recap of what I did with them.
Ultrasonic Bot 1.0 (below), achieved basic wall avoidance, and inspired many people to do robots like this one.
More info on Ultrasonic Bot 1.0
Ultrasonic Bot 2.0 (below), has a narrower wheel base, and has two limit switches in addition to the ultrasonic sensor, to sense more types of stimuli.
I will have a video for Ultrasonic Bot 3.0 out soon!
More info on Ultrasonic Bot 2.0 and 3.0
If you have any questions or comments please post here, or post a question on the videos.