Ultrasonic sensor

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Define the pins for the ultrasonic sensor
const int trigPin = 9;
const int echoPin = 10;

// Define variables for duration and distance
long duration;
int distance;

// Initialize the LCD object with the address and dimensions of your LCD
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Define LED pins
const int ledLow = 11;
const int ledMid = 12;
const int ledHigh = 13;

// Function declarations
void initialize();
void measureDistance();
void displayDistance();
void determineDistanceCategory();
void turnOnLowLED();
void turnOnMidLED();
void turnOnHighLED();

void setup() {
  initialize();
}

void loop() {
  measureDistance();
  displayDistance();
  determineDistanceCategory();
  delay(500);
}

void initialize() {
  // Initialize serial communication
  Serial.begin(9600);

  // Initialize LCD display
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.print("Distance: ");

  // Set LED pins as outputs
  pinMode(ledLow, OUTPUT);
  pinMode(ledMid, OUTPUT);
  pinMode(ledHigh, OUTPUT);

  // Set trigPin as an output and echoPin as an input
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void measureDistance() {
  // Clear the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  // Send a pulse to the trigPin
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Measure the duration of the pulse on the echoPin
  duration = pulseIn(echoPin, HIGH);

  // Calculate the distance in centimeters
  distance = duration * 0.034 / 2;
}

void displayDistance() {
  // Print the distance to the Serial Monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  // Display the distance on the LCD display
  lcd.setCursor(10,0);
  lcd.print(distance);
  lcd.print(" cm   ");
}

void determineDistanceCategory() {
  // Clear the second row of the LCD display
  lcd.setCursor(0,1);
  lcd.print("                  "); // Clear the row

  // Determine the distance category and display it on the LCD
  lcd.setCursor(0,1);
  if(distance < 20) {
    lcd.print("Low");
    turnOnLowLED();
  } else if(distance >= 20 && distance < 50) {
    lcd.print("Mid");
    turnOnMidLED();
  } else {
    lcd.print("High");
    turnOnHighLED();
  }
}

void turnOnLowLED() {
  digitalWrite(ledLow, HIGH);
  digitalWrite(ledMid, LOW);
  digitalWrite(ledHigh, LOW);
}

void turnOnMidLED() {
  digitalWrite(ledLow, LOW);
  digitalWrite(ledMid, HIGH);
  digitalWrite(ledHigh, LOW);
}

void turnOnHighLED() {
  digitalWrite(ledLow, LOW);
  digitalWrite(ledMid, LOW);
  digitalWrite(ledHigh, HIGH);
}