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Suneth Attygalle made a pair of sight-blocking goggles that help you echolocate with the use of an ultrasonic rangefinder sensor. He used an Atmega8 chip running an Arduino bootloader, and some welding goggles. He even made a bat goggle instructable so you can make them yourself including source code and wiring diagram.
76 thoughts on “HOW TO – Ultrasonic bat goggles”
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“My eyes! The goggles do nothing!”
It would be enhanced if you had microcomputers around. You could send out chirps and use cross correlation to determine the impulse response of the channel. Those ultrasonic transmitters only have a bandwidth of about 1 kHz. It should be possible to use an ATMega8 processor for the cross correlation. With smart hardware this might even be done with very little hardware.
People that can’t see well enough to move around would benefit from this.