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

LiquidCrystal_I2C lcd(0x27, 16, 2);

byte patterns[6][8] = {
  { 0b00000, 0b00000, 0b00000, 0b00000, 0b00000, 0b00000, 0b00000, 0b00000 },
  { 0b10000, 0b10000, 0b10000, 0b10000, 0b10000, 0b10000, 0b10000, 0b10000 },
  { 0b11000, 0b11000, 0b11000, 0b11000, 0b11000, 0b11000, 0b11000, 0b11000 },
  { 0b11100, 0b11100, 0b11100, 0b11100, 0b11100, 0b11100, 0b11100, 0b11100 },
  { 0b11110, 0b11110, 0b11110, 0b11110, 0b11110, 0b11110, 0b11110, 0b11110 },
  { 0b11111, 0b11111, 0b11111, 0b11111, 0b11111, 0b11111, 0b11111, 0b11111 }
};

void setup() {
  lcd.init();
  lcd.backlight();
  for (int i = 0; i < 6; i++) {
    lcd.createChar(i, patterns[i]);
  }
}

void loop() {
  for (int i = 0; i < 80; i++) {
    lcd.setCursor(0, 0);
    lcd.print(i);
    lcd.print("   ");
    updateProgressBar(i, 80, 1);
    delay(12);
  }
}

void updateProgressBar(unsigned long count, unsigned long totalCount, int lineToPrintOn) {
  double factor = totalCount / 80.0;
  int percent = (count + 1) / factor;
  int number = percent / 5;
  int remainder = percent % 5;
  if (number > 0) {
    for (int j = 0; j < number; j++) {
      lcd.setCursor(j, lineToPrintOn);
      lcd.write(5);
    }
  }
  lcd.setCursor(number, lineToPrintOn);
  lcd.write(remainder);
  if (number < 16) {
    for (int j = number + 1; j <= 16; j++) {
      lcd.setCursor(j, lineToPrintOn);
      lcd.write(0);
    }
  }
}