Keyestudio ESP32 - Page 310

ESP32 Starter Kit
2. Working Principle
As we all know, ultrasonic is a kind of inaudible sound wave signal with high frequency. Similar to a bat, this module
measures distance of obstacles by calculating the time difference between wave-emitting and echo-receiving.
Maximum distance: 3M
Minimum distance: 5cm
Detection angle: 15°
306 Chapter 9. Scratch Tutorial