Figure 4. Timing Diagram to explain the working of an Ultrasonic sensor [3]

From

Smart Electronic Travel Stick for the Visually Challenged

Sambandh Bhusan Dhal, Arun Agarwal, Kabita Agarwal

American Journal of Electrical and Electronic Engineering. 2016, 4(6), 177-181 doi:10.12691/ajeee-4-6-4