Ultrasonic Distance Sensor

What is Ultrasonic Distance Sensor?

A sensor that measures distance by emitting a short pulse of sound above the range of human hearing and timing how long its echo takes to return, the same basic principle a bat uses to navigate in the dark. Multiplying that round-trip time by the speed of sound and halving it gives the distance to whatever reflected the pulse.

The five clues

Engineerdle #74 described Ultrasonic Distance Sensor with five clues, revealed one at a time from hardest to most direct. Each clue points at a different property of the concept.

1. 01A ranging sensor working entirely above the range of human hearing.
2. 02It measures distance the same basic way a bat does.
3. 03A short pulse is sent out, and the sensor waits for its echo to return.
4. 04Distance comes from multiplying that time delay by the speed of sound and halving the result.
5. 05A sensor that measures distance by timing how long a high-frequency sound pulse takes to echo back.