For my first Instructable, I will show you how to build your own ultrasonic batgoggles using an Arduino microcontroller clone, Devantech ultrasonic sensor and welding goggles for around $60 or less if you already have standard electronics components. You could also skip the electronics and make a simple bat-mask perfect to wear to the next Batman movie. In that case, the cost would only be about $15.
These goggles allow you to experience what it is like to use auditory cues like a bat and is intended for children in a science center setting to learn about echolocation. The goal was to keep costs as low as possible, avoid making the form of the interaction to be generic or unrelated to its educational purpose and to ensure that the physical form of device embodies the subject matter. For a more thorough discussion of its design, please see the project webpage.
http://www.instructables.com/id/ultrasonic-batgoggles/
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