Ultrasonic sensor HC-SRO4 giving 0 distance whenever I tried to test the sensor with arduino

Other Hardware Sensors
1

Hi all,

I need a big help. I am new to Arduino and trying with a Ultrasonic sensor for my school project.

I used below code and did the wiring correctly, but it give Distance 0 all the time, then I bought a new sensor after tried so many with my existing sensor, but same issue is there with the new sensor too. And when tested from a shop even my old sensor works there.

Can't identify what is wrong with the below code or is there anything to do with IDE version? I have no clue how to fix.
I tried to find in the other posts too...But still struggling.


const int trigPin = 9;
const int echoPin = 10;

long duration;
long distance;


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

void loop() {  

  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH, 1);
  distance =  duration*0.034/2;
  Serial.print("Distance : ");
  Serial.print(distance);
  Serial.println(" cm ");
  delay(500);
}

Much appreciate your help on this.

2

The timeout for your call to pulseIn() seems to be too low.
You are giving it 1 microsecond.
Try the following instead, which will use default timeout of 1 second (1,000,000 microseconds):

duration = pulseIn(echoPin, HIGH);

, or try with some higher value:

duration = pulseIn(echoPin, HIGH, 100000);
1 Like
3

The @breadboard_led is wright, the value is very, very low.
See your code running ok here with value 30000.