arduino_dist.ino

#include <LiquidCrystal_I2C.h>

const int trigPin = 9;
const int echoPin = 10;

long duration;
int distanceCm, distanceInch;
LiquidCrystal_I2C lcd(0x27, 16, 2);
void setup() {
lcd.begin(); 
Serial.begin(9600);
pinMode(trigPin, OUTPUT);
pinMode(13, OUTPUT);
pinMode(echoPin, INPUT);
}

void loop() {
digitalWrite(13, HIGH);
  
digitalWrite(trigPin, LOW);
delayMicroseconds(2);

digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);
distanceCm= duration*0.034/2;
distanceInch = duration*0.0133/2;

lcd.setCursor(0,0);
lcd.print("Distance: "); 
lcd.print(distanceCm); 
lcd.print(" cm");
delay(10);
lcd.setCursor(0,1);
lcd.print("Distance: ");
lcd.print(distanceInch);
lcd.print(" inch");
Serial.println(distanceCm);
Serial.println(distanceInch);
delay(10);



}