Question

What is the purpose of the pin named ECHO of HC-SR04 sensor?

A.Allows the ultrasonic sound wave to be sent from the sensor.
B.Provides the information that the ultrasonic sound wave is returned.
C.Allows the sensor to be fed with energy.
D.Provides the chassis connection of the sensor.

Answer 1

The purpose of the pin named ECHO on the HC-SR04 sensor is to provide information about the returned ultrasonic sound wave.

Step-by-step explanation:

The purpose of the pin named ECHO on the HC-SR04 sensor is to provide the information that the ultrasonic sound wave is returned. When the sensor emits an ultrasonic sound wave, it listens for the echoes that bounce back. The time it takes for the echo to return is directly proportional to the distance of the reflector. By measuring the time between the emission of the sound wave and the reception of the echo, the HC-SR04 sensor can calculate the distance to an object.