Keyestudio Micro:bit Mini Smart Robot Car Manual page 62

www.keyestudio.com
The principle of the ultrasonic module is as the same as the above principle.
The ultrasonic module will emit the ultrasonic waves after trigger signal. When the ultrasonic waves encounter
the object and are reflected back, the ultrasonic module outputs an echo signal, so it can determine the distance
of object from the time difference between trigger signal and echo signal.
Ultrasonic sensor has a wide range of sensitivity, no blind area, and no interference with obstacles.
As the following picture shown, it is our keyestudio ultrasonic module. It has two somethings like eyes.
One is transmitting end, the other is receiving end.
44