Arduino Ultrasonic sensor hc-sr04 Measure distance with LEDs

The Ultrasonic sensor is very popular and used to measure the distance to an object. It comes complete with ultrasonic transmitter and receiver modules. Hc-sr04 transmit high-frequency sound and when an object detects then reflect the signal to echo.

⚙Features:  
Distance measure:- 2cm to 400cm📏.
Power Supply: +5V DC.
Measuring Angle: 30 degree.
uses as: Obstacle avoiding robot, distance measure, measure water level and many more.

Requirement:
1. Arduino Uno 
2. Ultrasonic sensor Hc-sr04
3. 7 x LEDs
4. 7 x 220ohm resistor
5. Breadboard 
6. jumper wire 

Coding:

const int trig = 12;

const int echo = 13;

int duration = 0;

int distance = 0;

void setup() 

{

  pinMode(trig , OUTPUT);

  pinMode(echo , INPUT);

    

  Serial.begin(9600);

}

void loop()

{

  digitalWrite(trig , HIGH);

  delayMicroseconds(1000);

  digitalWrite(trig , LOW);

  duration = pulseIn(echo , HIGH);

  distance = (duration/2) / 29.1 ;

  Serial.println(distance);

}

Coding:

const int trig = 12;

const int echo = 13;

const int LED1 = 8;

const int LED2 = 7;

const int LED3 = 6;

const int LED4 = 5;

const int LED5 = 4;

const int LED6 = 3;

const int LED7 = 2;

int duration = 0;

int distance = 0;

void setup() 

{

  pinMode(trig , OUTPUT);

  pinMode(echo , INPUT);

  

  pinMode(LED1 , OUTPUT);

  pinMode(LED2 , OUTPUT);

  pinMode(LED3 , OUTPUT);

  pinMode(LED4 , OUTPUT);

  pinMode(LED5 , OUTPUT);

  pinMode(LED6 , OUTPUT);

  pinMode(LED7 , OUTPUT);

  

  Serial.begin(9600);

}

void loop()

{

  digitalWrite(trig , HIGH);

  delayMicroseconds(1000);

  digitalWrite(trig , LOW);

  duration = pulseIn(echo , HIGH);

  distance = (duration/2) / 28.5 ;

  Serial.println(distance);

  

  if ( distance <= 7 )

  {

    digitalWrite(LED1, HIGH);

  }

  else

  {

    digitalWrite(LED1, LOW);

  }

  if ( distance <= 14 )

  {

    digitalWrite(LED2, HIGH);

  }

  else

  {

    digitalWrite(LED2, LOW);

  }

  if ( distance <= 21 )

  {

    digitalWrite(LED3, HIGH);

  }

  else

  {

    digitalWrite(LED3, LOW);

  }

  if ( distance <= 28 )

  {

    digitalWrite(LED4, HIGH);

  }

  else

  {

    digitalWrite(LED4, LOW);

  }

  if ( distance <= 35 )

  {

    digitalWrite(LED5, HIGH);

  }

  else

  {

    digitalWrite(LED5, LOW);

  }

  if ( distance <= 42 )

  {

    digitalWrite(LED6, HIGH);

  }

  else

  {

    digitalWrite(LED6, LOW);

  }

  if ( distance <= 49 )

  {

    digitalWrite(LED7, HIGH);

  }

  else

  {

    digitalWrite(LED7, LOW);

  }

}

Watch This👀:-

,