How to Make an Ultrasonic Ruler with Arduino UNO and HC-SR04

This is my first project, so please like the project and comment down below.

Feb 16, 2018

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Devices & Components

Arduino Uno Rev3

Ultrasonic Sensor - HC-SR04 (Generic)

Jumper wires (generic)

Breadboard (generic)

Laptop or computer

USB-A to B Cable

Software & Tools

Arduino IDE

Project description

Code

Ultrasonic ruler with inches, centimetres, and millimetres

arduino

This the code. Just copy it and paste it on your Arduino IDE. Comment down below how I can make this code better.

1const int trigPin = 2;
2const int echoPin = 4;
3void setup() { 
4Serial.begin(9600);}
5  
6void loop()
7{
8long duration, inches, cm, mm;
9pinMode(trigPin, OUTPUT);
10  
11digitalWrite(trigPin, LOW); 
12delayMicroseconds(2000); 
13digitalWrite(trigPin,
14  HIGH); 
15delayMicroseconds(1000); 
16digitalWrite(trigPin, LOW);
17pinMode(echoPin,
18  INPUT); 
19duration = pulseIn(echoPin, HIGH);
20inches = microsecondsToInches(duration);
21  
22cm = microsecondsToCentimeters(duration);
23mm = microsecondsToMillimeters(duration);
24Serial.print(inches);
25  
26Serial.print("in, "); 
27Serial.print(cm);
28Serial.print("cm, ");
29Serial.print(mm);
30Serial.print("
31  mm");
32Serial.println(); 
33delay(1000);
34}
35long microsecondsToInches(long
36  microseconds)
37{return microseconds / 74 / 2;}
38long microsecondsToCentimeters(long
39  microseconds)
40{return microseconds / 29 / 2;}
41long microsecondsToMillimeters(long
42  microseconds)
43{return microseconds / 2.9 / 2;}

const int trigPin = 2;
const int echoPin = 4;
void setup() { 
Serial.begin(9600);}
  
void loop()
{
long duration, inches, cm, mm;
pinMode(trigPin, OUTPUT);
  
digitalWrite(trigPin, LOW); 
delayMicroseconds(2000); 
digitalWrite(trigPin,
  HIGH); 
delayMicroseconds(1000); 
digitalWrite(trigPin, LOW);
pinMode(echoPin,
  INPUT); 
duration = pulseIn(echoPin, HIGH);
inches = microsecondsToInches(duration);
  
cm = microsecondsToCentimeters(duration);
mm = microsecondsToMillimeters(duration);
Serial.print(inches);
  
Serial.print("in, "); 
Serial.print(cm);
Serial.print("cm, ");
Serial.print(mm);
Serial.print("
  mm");
Serial.println(); 
delay(1000);
}
long microsecondsToInches(long
  microseconds)
{return microseconds / 74 / 2;}
long microsecondsToCentimeters(long
  microseconds)
{return microseconds / 29 / 2;}
long microsecondsToMillimeters(long
  microseconds)
{return microseconds / 2.9 / 2;}

Ultrasonic ruler with inches, centimetres, and millimetres

arduino

This the code. Just copy it and paste it on your Arduino IDE. Comment down below how I can make this code better.

1const int trigPin = 2;
2const int echoPin = 4;
3void setup() { 
4Serial.begin(9600);}  
5void loop()
6{
7long duration, inches, cm, mm;
8pinMode(trigPin, OUTPUT);  
9digitalWrite(trigPin, LOW); 
10delayMicroseconds(2000); 
11digitalWrite(trigPin,  HIGH); 
12delayMicroseconds(1000); 
13digitalWrite(trigPin, LOW);
14pinMode(echoPin,  INPUT); 
15duration = pulseIn(echoPin, HIGH);
16inches = microsecondsToInches(duration);  
17cm = microsecondsToCentimeters(duration);
18mm = microsecondsToMillimeters(duration);
19Serial.print(inches);  
20Serial.print("in, "); 
21Serial.print(cm);
22Serial.print("cm, ");
23Serial.print(mm);
24Serial.print("  mm");
25Serial.println(); 
26delay(1000);
27}
28long microsecondsToInches(long  microseconds)
29{return microseconds / 74 / 2;}
30long microsecondsToCentimeters(long  microseconds)
31{return microseconds / 29 / 2;}
32long microsecondsToMillimeters(long  microseconds)
33{return microseconds / 2.9 / 2;}

const int trigPin = 2;
const int echoPin = 4;
void setup() { 
Serial.begin(9600);}  
void loop()
{
long duration, inches, cm, mm;
pinMode(trigPin, OUTPUT);  
digitalWrite(trigPin, LOW); 
delayMicroseconds(2000); 
digitalWrite(trigPin,  HIGH); 
delayMicroseconds(1000); 
digitalWrite(trigPin, LOW);
pinMode(echoPin,  INPUT); 
duration = pulseIn(echoPin, HIGH);
inches = microsecondsToInches(duration);  
cm = microsecondsToCentimeters(duration);
mm = microsecondsToMillimeters(duration);
Serial.print(inches);  
Serial.print("in, "); 
Serial.print(cm);
Serial.print("cm, ");
Serial.print(mm);
Serial.print("  mm");
Serial.println(); 
delay(1000);
}
long microsecondsToInches(long  microseconds)
{return microseconds / 74 / 2;}
long microsecondsToCentimeters(long  microseconds)
{return microseconds / 29 / 2;}
long microsecondsToMillimeters(long  microseconds)
{return microseconds / 2.9 / 2;}

Downloadable files

Ultrasonic Ruler

Just wire the: VCC of Ultrasonic sensor ---> 5V in Arduino Trig of Ultrasonic sensor ---> Pin 2 in Arduino Echo of Ultrasonic sensor ---> Pin 4 in Arduino GND of Ultrasonic sensor ---> To GND in Arduino And then just copy and paste the code above in your Arduino IDE. To see the distance just go to Tools -> Serial Monitor or just put Ctrl+Shift+M or for mac just Command+Shift+M.

Ultrasonic Ruler

The Ultrasonic ruler helps you to measure things with Ultrasonic sounds.

Ultrasonic Ruler

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