HC SRO4 Ultra Sonic Sensor Not working?

Other Hardware Sensors
1

Distance: Out of range or error
00:36:25.521 -> Distance: Out of range or error
00:36:25.630 -> Distance: Out of range or error
00:36:25.763 -> Distance: Out of range or error
00:36:25.874 -> Distance: Out of range or error
00:36:26.014 -> Distance: Out of range or error
00:36:26.163 -> Distance: Out of range or error
00:36:26.280 -> Distance: Out of range or error

IMG_6171
IMG_6171683×910 61.5 KB

#define TRIG_PIN 8  // TRIG on pin 8
#define ECHO_PIN 7  // ECHO on pin 7

void setup() {
  Serial.begin(115200);  // Start serial communication

  pinMode(TRIG_PIN, OUTPUT);  // Set TRIG as OUTPUT
  pinMode(ECHO_PIN, INPUT);   // Set ECHO as INPUT
}

void loop() {
  // Clear the TRIG pin
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);  // Wait for 2 microseconds
  
  // Trigger the sensor by sending a HIGH pulse for 10 microseconds
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);  // Wait for 10 microseconds
  digitalWrite(TRIG_PIN, LOW);
  
  // Measure the time it takes for the pulse to return to the ECHO pin
  long duration = pulseIn(ECHO_PIN, HIGH);  // Measure pulse duration in microseconds
  
  // Calculate the distance in cm (speed of sound = 343 m/s, 1 cm = 29 microseconds)
  long distance = duration / 58.2;

  // Print the distance if it's valid, else print error message
  Serial.print("Distance: ");
  if (distance > 0 && distance < 400) {
    Serial.print(distance); 
    Serial.println(" cm");
  } else {
    Serial.println("Out of range or error");
  }

  delay(500);  // Wait before taking another reading
}
2

Possibly a wiring error or defective sensor.

3

Is there anyway to check if the sensor is defective?

4

The first thing to check is the wiring, which you forgot to describe.

Poor soldering of header pins, bad connectors, broken wires, bad breadboard connections, wrong connections, etc.

Please post a close up, focused photo showing all the wiring and connections.

5

Like you forgot to mention the arduino board you use and sensor supply voltage.

6

If you serial.Print(duration) you will see the error in your logic.