Ultrasonic rangfinders are a cheap and easy way to gather obstacle avoidance data. When added to a servo motor they form something of a scanning radar for ... hack used an Arduino and Processing ...

To supply targeting data for the launcher, an Arduino Uno uses an ultrasonic sensor pair mounted ... serve as a useful classroom demonstration of radar-like targeting techniques to a young audience.

Serial Kickstarter entrepreneur Patrick Thomas Mitchell has once again taken to Kickstarter to raise funds to take his new programmable Arduino ultrasonic experiment kit into manufacture.