• Harman Hack World

How to make Ultrasonic Range Finder using HC-SR04

Updated: Jul 28



In this post, we will be discussing about making a Ultrasonic Range Finder by using HC-SR04 sensor very easily at home. 

You can use any beginner kit of Arduino to make it, as the parts required are easily available with it.


Things required-

  • Arduino Uno R3

  • Breadboard

  • Jumper Wires

  • HC-SR04 sensor

  • Buzzer

  • LED

  • Resistor 220ohm


Procedure-


  • The HC-SR04 Ultrasonic Module has 4 pins, Ground, VCC, Trig and Echo.

  • The Ground and the VCC pins of the module needs to be connected to the Ground and the 5 volts pins on the Arduino Board respectively and the trig and echo pins to any Digital I/O pin on the Arduino Board.

  • The HC-SR04 sensor attach to the Breadboard

  • The Sensor VCC connect to the Arduino Board +5V

  • The Sensor GND connect to the Arduino Board GND The Sensor Trig connect to the Arduino Board Digital I/O 9

  • The Sensor Echo connect to the Arduino Board Digital I/O 10 Buzzer and LED The Buzzer attach to the Breadboard

  • The Buzzer long leg (+) connect to the Arduino Board Digital 11 The Buzzer short leg (-) connect to the Arduino Board GND

  • The LED attach to the Breadboard The Resistor connect to the LED long leg (+)

  • The Resistor other leg (from LED's long leg) connect to the Arduino Board Digital 13

  • The LED short leg (-) connect to the Arduino Board GND



Source Code:



// defines pins numbers
const int trigPin = 9;
const int echoPin = 10;
const int buzzer = 11;
const int ledPin = 13;
// defines variables
long duration;
int distance;
int safetyDistance;
void setup() {
pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
pinMode(echoPin, INPUT); // Sets the echoPin as an Input
pinMode(buzzer, OUTPUT);
pinMode(ledPin, OUTPUT);
Serial.begin(9600); // Starts the serial communication
}
void loop() {
// Clears the trigPin
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
// Sets the trigPin on HIGH state for 10 micro seconds
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
// Reads the echoPin, returns the sound wave travel time in microseconds
duration = pulseIn(echoPin, HIGH);
// Calculating the distance
distance= duration*0.034/2;
safetyDistance = distance;
if (safetyDistance <= 5){
  digitalWrite(buzzer, HIGH);
  digitalWrite(ledPin, HIGH);
}
else{
  digitalWrite(buzzer, LOW);
  digitalWrite(ledPin, LOW);
}
// Prints the distance on the Serial Monitor
Serial.print("Distance: ");
Serial.println(distance);
}



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