Echo locator

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)  

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NXT sensors

Touch Sensor The Touch Sensor gives your robot a sense of touch. The Touch Sensor detects when it is being pressed by something and when it is released again. Suggestions: You can use the Touch Sensor to make your robot pick up things: a robotic arm equipped with a Touch Sensor lets the robot know […]

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