How to measure distance with arduino


Materials:-
  • Ultrasonic sensor
  • LCD display
  • 10k potrntiometer
  • Jumper wire

Diagram:-

Connections:-

Vss = Arduino GND
VDD = Arduino 5V
V0 = Potentiometer center pin
RS = Digital pin  1
RW = Arduino GND
E = Digital pin 2
D4 = Arduino digital pin 3
D5  = Arduino digital pin 4
D6 = Arduino digital pin 5
D7 = Arduino digital pin 6
A = Arduino  5V
K = Arduino GND
Ultrasonic GND = Arduino GND
Ultrasonic 5V = Arduino 5V
Ultrasonic Echo = Arduino digital pin 8
Ultrasonic trig =  Arduino digital pin 9
Potentiometer left pin = Arduino 5V
Potentiometer right pin = Arduino GND

Code:-

//https://mrarduinoprojects.blogspot.com
#include <LiquidCrystal.h> // includes the LiquidCrystal Library
LiquidCrystal lcd(1, 2, 3, 4, 5, 6); // Creates an LCD object. Parameters: (rs, enable, d4, d5, d6, d7) 
const int trigPin = 8;
const int echoPin = 9;
long duration;
int distanceCm, distanceInch;
void setup() {
lcd.begin(16,2); // Initializes the interface to the LCD screen, and specifies the dimensions (width and height) of the display
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);
distanceCm= duration*0.034/2;
distanceInch = duration * 0.01330 / 2;
lcd.setCursor(0,0); // Sets the location at which subsequent text written to the LCD will be displayed
lcd.print("Distance: "); // Prints string "Distance" on the LCD
lcd.print(distanceCm); // Prints the distance value from the sensor
lcd.print(" cm");
delay(10);
lcd.setCursor(0,1);
lcd.print("Distance: ");
lcd.print(distanceInch);
lcd.print(" inch");
delay(10);
}