Ultrasonic Sensor Problem

Other Hardware Sensors
1

First off, I would just like to say that I am a beginner and barely know the basics of Arduino. I tried to make a circuit which would have a LED light up when an object is put at a distance closer than 10 cm relative to the ultrasonic sensor. I was wondering why the LED would not light up and a distance more than 0 cm would not be displayed on the Serial Monitor.

Here is my code...

const int trigpin = 11;

const int echopin = 8;

const int led = 4;

void setup() {
Serial.begin(9600);
pinMode (trigpin, OUTPUT);
pinMode (echopin, INPUT);
pinMode (led, OUTPUT);
}

void loop() {

long duration, distance;
digitalWrite (trigpin, HIGH);
delayMicroseconds(1000);
duration = pulseIn(echopin, HIGH);
distance = (duration/2)/29.1;
Serial.print (distance);
Serial.println ("CM");
delay (10);

if ((distance <= 10))
{
digitalWrite (led, HIGH);
}
else if (distance> 10);
{
digitalWrite (led, LOW);
}
}

2

Change :

  • delayMicroseconds(1000) to delayMicroseconds(10)
  • distance = (duration/2)/29.1 to distance_cm = 0.017 * duration_us;

Refer to instruction about Ultrasonic Sensor

3

It still wont work. Do you think that maybe the sensor is broken?

4

You need to add: digitalWrite (trigpin, LOW) after delayMicroseconds(10). If still not work, check your wiring diagram and code in comparison with the link I mentioned above. If still not work, post the image of real wiring diagram.

5

It still wont work so here is the attached picture. Thank you again for helping and sorry for late reply.