Echo locator August 17, 2013 Leave a comment Posted by CEEO How could you build a device that uses sound to indicate the distance to the nearest object? For example, as an aid for a person with vision impairment. Other than using the Ultrasound Sensor, are there any other sensors that could be used to measure distance? Resources Echo Locator lesson plan – NXT-G (PDF) Add a comment Cancel reply? You must be logged in to comment.