DIY Ultrasonic Sensor Measurement

1#include <Wire.h> //The "Wire" library should be pre installed with   your IDE if not download it.
2#include <LiquidCrystal_I2C.h> //This library requires   you to manually download it so here is the download link: https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library
3
4LiquidCrystal_I2C   lcd(0x27, 16, 2);//I2C address and dimensions you may need to change it if your   LCD is different.
5int length = 0;//The length of the object
6int range = 20;//Set   the range of your obejct's length
7
8//Declares the pins on the ultrasonic sensor
9long   readUltrasonicDistance(int triggerPin, int echoPin)
10{
11  pinMode(triggerPin,   OUTPUT);// Clear the trigger
12  digitalWrite(triggerPin, LOW);
13  delayMicroseconds(2);
14   // Sets the trigger pin to HIGH state for 10 microseconds
15  digitalWrite(triggerPin,   HIGH);
16  delayMicroseconds(10);
17  digitalWrite(triggerPin, LOW);
18  pinMode(echoPin,   INPUT);
19  // Reads the echo pin, and returns the sound wave travel time in microseconds
20   return pulseIn(echoPin, HIGH);
21}
22
23void setup()
24{
25  // initialize   the LCD
26  lcd.begin();
27
28  // Turn on the blacklight to print a message.
29   lcd.backlight();
30}
31
32void loop()
33{
34  //Ok heres were all the math   is. It may look a little scary but all it's doing is subtracting the distance the   ultrasonic sensor senses by the range and getting the absoulute value of it which   is the length of the object.
35  length = abs((0.01723 * readUltrasonicDistance(9,   10) - range)); 
36  //This just prints out "Object Length" and then the object   length.
37  lcd.print("Object Length:");
38  lcd.setCursor(0,1);
39 lcd.print(length);
40   delay(500);
41 lcd.clear();
42}
43

1#include <Wire.h> //The "Wire" library should be pre installed with
2  your IDE if not download it.
3#include <LiquidCrystal_I2C.h> //This library requires
4  you to manually download it so here is the download link: https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library
5
6LiquidCrystal_I2C
7  lcd(0x27, 16, 2);//I2C address and dimensions you may need to change it if your
8  LCD is different.
9int length = 0;//The length of the object
10int range = 20;//Set
11  the range of your obejct's length
12
13//Declares the pins on the ultrasonic sensor
14long
15  readUltrasonicDistance(int triggerPin, int echoPin)
16{
17  pinMode(triggerPin,
18  OUTPUT);// Clear the trigger
19  digitalWrite(triggerPin, LOW);
20  delayMicroseconds(2);
21
22  // Sets the trigger pin to HIGH state for 10 microseconds
23  digitalWrite(triggerPin,
24  HIGH);
25  delayMicroseconds(10);
26  digitalWrite(triggerPin, LOW);
27  pinMode(echoPin,
28  INPUT);
29  // Reads the echo pin, and returns the sound wave travel time in microseconds
30
31  return pulseIn(echoPin, HIGH);
32}
33
34void setup()
35{
36  // initialize
37  the LCD
38  lcd.begin();
39
40  // Turn on the blacklight to print a message.
41
42  lcd.backlight();
43}
44
45void loop()
46{
47  //Ok heres were all the math
48  is. It may look a little scary but all it's doing is subtracting the distance the
49  ultrasonic sensor senses by the range and getting the absoulute value of it which
50  is the length of the object.
51  length = abs((0.01723 * readUltrasonicDistance(9,
52  10) - range)); 
53  //This just prints out "Object Length" and then the object
54  length.
55  lcd.print("Object Length:");
56  lcd.setCursor(0,1);
57 lcd.print(length);
58
59  delay(500);
60 lcd.clear();
61}
62