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

// Define pins for Potentiometer, LEDs, and LCD
int trigPin = 5;
int echoPin = 18;

int potPin = 32;
int led[] = { 12, 13, 14, 15, 16, 17, 23, 19 };
LiquidCrystal_I2C lcd(0x27, 16, 2);

byte customChar1[8] = {
  0B01110,
  0B11111,
  0B00001,
  0B01110,
  0B10001,
  0B00001,
  0B01111,
  0B10001
};
byte customChar2[8] = {
  0B00000,
  0B00100,
  0B01010,
  0B00110,
  0B00010,
  0B01010,
  0B00110,
  0B00010
};
byte customChar3[8] = {
  0B01110,
  0B10000,
  0B01000,
  0B01000,
  0B01000,
  0B01000,
  0B01100,
  0B01100
};
byte customChar4[8] = {
  0B00010,
  0B00010,
  0B00000,
  0B01010,
  0B10101,
  0B10001,
  0B10101,
  0B11001
};

void setup() {
  // Initialize LCD
  lcd.init();
  lcd.backlight();

  // Initialize ultrasonic sensor pins
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  for (int i = 0; i < 8; i++) {
    pinMode(led[i], OUTPUT);
  }

  lcd.createChar(0, customChar1);
  lcd.createChar(1, customChar2);
  lcd.createChar(2, customChar3);
}

void ledPattern1() {
  digitalWrite(led[0], 1);
  digitalWrite(led[1], 1);  //1
  digitalWrite(led[2], 1);
  digitalWrite(led[3], 1);
  digitalWrite(led[4], 0);
  digitalWrite(led[5], 0);
  digitalWrite(led[6], 0);
  digitalWrite(led[7], 0);
  delay(500);
  digitalWrite(led[0], 0);  //2
  digitalWrite(led[1], 1);
  digitalWrite(led[2], 1);
  digitalWrite(led[3], 1);
  digitalWrite(led[4], 1);
  digitalWrite(led[5], 0);
  digitalWrite(led[6], 0);
  digitalWrite(led[7], 0);
  delay(500);
  digitalWrite(led[0], 0);  //3
  digitalWrite(led[1], 0);
  digitalWrite(led[2], 1);
  digitalWrite(led[3], 1);
  digitalWrite(led[4], 1);
  digitalWrite(led[5], 1);
  digitalWrite(led[6], 0);
  digitalWrite(led[7], 0);
  delay(500);
  digitalWrite(led[0], 0);  //4
  digitalWrite(led[1], 0);
  digitalWrite(led[2], 0);
  digitalWrite(led[3], 1);
  digitalWrite(led[4], 1);
  digitalWrite(led[5], 1);
  digitalWrite(led[6], 1);
  digitalWrite(led[7], 0);
  delay(500);
  digitalWrite(led[0], 0);  //5
  digitalWrite(led[1], 0);
  digitalWrite(led[2], 0);
  digitalWrite(led[3], 0);
  digitalWrite(led[4], 1);
  digitalWrite(led[5], 1);
  digitalWrite(led[6], 1);
  digitalWrite(led[7], 1);
  delay(500);
  digitalWrite(led[0], 0);  //6
  digitalWrite(led[1], 0);
  digitalWrite(led[2], 0);
  digitalWrite(led[3], 0);
  digitalWrite(led[4], 1);
  digitalWrite(led[5], 1);
  digitalWrite(led[6], 1);
  digitalWrite(led[7], 1);
  delay(500);
  digitalWrite(led[0], 0);  //7
  digitalWrite(led[1], 0);
  digitalWrite(led[2], 0);
  digitalWrite(led[3], 1);
  digitalWrite(led[4], 1);
  digitalWrite(led[5], 1);
  digitalWrite(led[6], 1);
  digitalWrite(led[7], 0);
  delay(500);
  digitalWrite(led[0], 0);  //8
  digitalWrite(led[1], 0);
  digitalWrite(led[2], 1);
  digitalWrite(led[3], 1);
  digitalWrite(led[4], 1);
  digitalWrite(led[5], 1);
  digitalWrite(led[6], 0);
  digitalWrite(led[7], 0);
  delay(500);
  digitalWrite(led[0], 0);  //9
  digitalWrite(led[1], 1);
  digitalWrite(led[2], 1);
  digitalWrite(led[3], 1);
  digitalWrite(led[4], 1);
  digitalWrite(led[5], 0);
  digitalWrite(led[6], 0);
  digitalWrite(led[7], 0);
  delay(500);
  digitalWrite(led[0], 0);  //10
  digitalWrite(led[1], 0);
  digitalWrite(led[2], 0);
  digitalWrite(led[3], 0);
  digitalWrite(led[4], 0);
  digitalWrite(led[5], 0);
  digitalWrite(led[6], 0);
  digitalWrite(led[7], 0);
  delay(500);
}

void ledPattern2() {
  digitalWrite(led[0], 0);
  digitalWrite(led[1], 0);  //1
  digitalWrite(led[2], 0);
  digitalWrite(led[3], 0);
  digitalWrite(led[4], 1);
  digitalWrite(led[5], 1);
  digitalWrite(led[6], 1);
  digitalWrite(led[7], 1);
  delay(500);
  digitalWrite(led[0], 1);  //2
  digitalWrite(led[1], 0);
  digitalWrite(led[2], 0);
  digitalWrite(led[3], 0);
  digitalWrite(led[4], 0);
  digitalWrite(led[5], 1);
  digitalWrite(led[6], 1);
  digitalWrite(led[7], 1);
  delay(500);
  digitalWrite(led[0], 1);  //3
  digitalWrite(led[1], 1);
  digitalWrite(led[2], 0);
  digitalWrite(led[3], 0);
  digitalWrite(led[4], 0);
  digitalWrite(led[5], 0);
  digitalWrite(led[6], 1);
  digitalWrite(led[7], 1);
  delay(500);
  digitalWrite(led[0], 1);  //4
  digitalWrite(led[1], 1);
  digitalWrite(led[2], 1);
  digitalWrite(led[3], 0);
  digitalWrite(led[4], 0);
  digitalWrite(led[5], 0);
  digitalWrite(led[6], 0);
  digitalWrite(led[7], 1);
  delay(500);
  digitalWrite(led[0], 1);  //5
  digitalWrite(led[1], 1);
  digitalWrite(led[2], 1);
  digitalWrite(led[3], 1);
  digitalWrite(led[4], 0);
  digitalWrite(led[5], 0);
  digitalWrite(led[6], 0);
  digitalWrite(led[7], 0);
  delay(500);
  digitalWrite(led[0], 1);  //6
  digitalWrite(led[1], 1);
  digitalWrite(led[2], 1);
  digitalWrite(led[3], 0);
  digitalWrite(led[4], 0);
  digitalWrite(led[5], 0);
  digitalWrite(led[6], 0);
  digitalWrite(led[7], 1);
  delay(500);
  digitalWrite(led[0], 1);  //7
  digitalWrite(led[1], 1);
  digitalWrite(led[2], 0);
  digitalWrite(led[3], 0);
  digitalWrite(led[4], 0);
  digitalWrite(led[5], 0);
  digitalWrite(led[6], 1);
  digitalWrite(led[7], 1);
  delay(500);
  digitalWrite(led[0], 1);  //8
  digitalWrite(led[1], 0);
  digitalWrite(led[2], 0);
  digitalWrite(led[3], 0);
  digitalWrite(led[4], 0);
  digitalWrite(led[5], 1);
  digitalWrite(led[6], 1);
  digitalWrite(led[7], 1);
  delay(500);
  digitalWrite(led[0], 0);  //9
  digitalWrite(led[1], 0);
  digitalWrite(led[2], 0);
  digitalWrite(led[3], 0);
  digitalWrite(led[4], 1);
  digitalWrite(led[5], 1);
  digitalWrite(led[6], 1);
  digitalWrite(led[7], 1);
  delay(500);
  digitalWrite(led[0], 1);  //10
  digitalWrite(led[1], 1);
  digitalWrite(led[2], 1);
  digitalWrite(led[3], 1);
  digitalWrite(led[4], 1);
  digitalWrite(led[5], 1);
  digitalWrite(led[6], 1);
  digitalWrite(led[7], 1);
  delay(500);
}


void loop() {
  long duration, inches, cm;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  inches = duration / 74 / 2;
  cm = duration / 29 / 2;

  lcd.setCursor(0, 0);
  lcd.print(cm);
  lcd.setCursor(5, 0);
  lcd.print("cm");

  delay(100);

  if (cm < 35) {
    // Turn off all LEDs
    for (int i = 0; i < 8; i++) {
      digitalWrite(led[i], LOW);
    }
  } else if (cm >= 35) {
    ledPattern1();
  } else if (cm >= 40) {
    ledPattern2();
  } else {
    // Turn on all LEDs and display message
    for (int i = 0; i < 8; i++) {
      digitalWrite(led[i], HIGH);
    }

    lcd.setCursor(0, 1);
    lcd.write(byte(0));
    lcd.write(byte(1));
    lcd.write(byte(2));
    delay(5000);
  }

  lcd.clear();
}