Ultrasonic sensor in aurdino with code

                   Ultrasonic sensor in aurdino with code

Connection
       *vcc of ultrasonic sonsor to +5v
       *Gnd pin to Gnd pin of aurdino
       *trigpin to pin no 13
       *echopin to pin no 12
       *led 1 to pin no 7
       *led 2 to pin no 8
       *Gnd of led to gnd pin of aurdino
 
Circuit Diagram

Procedure
        *connect the circuit as shown in figure
        *copy and paste the code given below
        *upload the code
        *then check it
Code
/*
  connect ultrasonic sensor +vcc to 5v
  connect echopin to pin no 12
  connect trigpin to pin no 13
 */
#define trigPin 13
#define echoPin 12
#define led 7
#define led2 8

void setup() {
  Serial.begin (9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(led, OUTPUT);
  pinMode(led2, OUTPUT);
}

void loop() {
  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;
  if (distance < 4) {
    digitalWrite(led,HIGH);
  digitalWrite(led2,LOW);
}
  else {
    digitalWrite(led,LOW);
    digitalWrite(led2,HIGH);
  }
  if (distance >= 200 || distance <= 0){
    Serial.println("Out of range");
  }
  else {
    Serial.print(distance);
    Serial.println(" cm");
  }
  delay(500);
}


Lets check how is it work;