Ultrasonic sensor working principle | How does HC-SR04 Work

Ultrasonic sensor or ultrasound sensor is one of the most used sensor in various projects.It is generally used to find the range/distance of objects.The HC-SR 04 is one of the commonly used ultrasonic sensor.This sensor produces a ultrasound which is reflected back if an object is present in front of it.Then this reflected sound is detected by the receiver of the sensor .The distance is calculated by calculating the time travelled by the sound and velocity of sound.Watch the animation in the video.
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Ultrasonic sensor working principle | How does HC-SR04 Work

[rayapudihindusri]

// Define the pins for the ultrasonic sensor
const int trigPin = 9;
const int echoPin = 10;

// Define the pin for the servo motor that makes the dinosaur jump
const int servoPin = 6;

// Include the Servo library
#include <Servo.h>

// Create a Servo object
Servo myServo;

void setup() {
// Initialize the ultrasonic sensor pins
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);

// Attach the servo motor to its pin
myServo.attach(servoPin);
}

void loop() {
// Measure the distance to the nearest obstacle
long duration, distance;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration / 2) / 29.1; // Convert to distance

// If an obstacle is detected within 20 cm, make the dinosaur jump
if (distance < 20) {
// Make the dinosaur jump by moving the servo motor
myServo.write(90); // Adjust this angle as needed for the jump
delay(500); // Adjust the delay as needed for the jump duration
myServo.write(0); // Return to the original position
}

delay(100); // Wait before the next loop iteration
}

[plouf]

What guarantees that the sound will be coming back? If the sensor is not perpendicular to the surface checked for instance?

[chelladeepa]

How to purchase the this material can you send the link

[ashoksafaya]

My objective is to test ultrasound generator like mosquito or rodant repellent.

[pvsreenath]

Is ultrasonic sensor sound is harmful?

[mrzloopa]

Hi! nice work. Can you help me with some similar circuit?

[Northstar-Media]

Does the Zino 2 drone use this module?