Arduino and ultrasonic sensor measurement circuit with coding

Arduino project

Needed

Arduino UNO R3 =1

HC-SR04 Ultrasonic Sensor =1

Red LED =1

Green LED =1

560 ohm Resistors =2

Half Breadboard =1

Eight (8) Male/Male hookup wires =1

Connecting method

Pin configurations

HC-SR04 Ping distance sensor]

VCC to arduino 5v GND to arduino GND

Echo to Arduino pin 13 Trig to Arduino pin 12

Red POS to Arduino pin 11

Green POS to Arduino pin 10

560 ohm resistor to both LED NEG and GRD power rail

Copy this below code and upload in your arduino

#define trigPin 13

#define echoPin 12

#define led 11

#define led2 10

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);  // Added this line

  delayMicroseconds(2); // Added this line

  digitalWrite(trigPin, HIGH);

//  delayMicroseconds(1000); - Removed this line

  delayMicroseconds(10); // Added this line

  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);

  distance = (duration/2) / 29.1;

  if (distance < 4) {  // This is where the LED On/Off happens

    digitalWrite(led,HIGH); // When the Red condition is met, the Green LED should turn off

  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);

}

100% tested & working sucessfully try in on your home