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### Topic: Ultrasonic Sensor Problem (Read 90 times)previous topic - next topic

#### H_A2580

##### Nov 11, 2019, 04:49 am
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...
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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);
}
}

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#### IoT_hobbyist

#1
##### Nov 11, 2019, 04:57 amLast Edit: Nov 11, 2019, 04:58 am by IoT_hobbyist
Change :
• delayMicroseconds(1000) to delayMicroseconds(10)
• distance = (duration/2)/29.1 to distance_cm = 0.017 * duration_us;

Refer to instruction about Ultrasonic Sensor

#### H_A2580

#2
##### Nov 11, 2019, 05:04 am
It still wont work. Do you think that maybe the sensor is broken?

#### IoT_hobbyist

#3
##### Nov 11, 2019, 05:11 am
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.

#### H_A2580

#4
##### Nov 12, 2019, 07:08 amLast Edit: Nov 12, 2019, 07:16 am by H_A2580
It still wont work so here is the attached picture. Thank you again for helping and sorry for late reply.

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