#include <LiquidCrystal_I2C.h>
#include "RTClib.h"

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);
RTC_DS1307 rtc;

#define SCALE_CLEAR0   0
#define SCALE_CLEAR1   1
#define SCALE_CLEAR2   2
#define SCALE_CLEAR3   3
#define SCALE_CLEAR4   4
#define SCALE_CLEAR5   5

int level;
int sec_num;
int num;


void setup() {
  Serial.begin(9600);
  // Init
  lcd.init();
  lcd.backlight();

  rtc.begin();

  byte scaleChar0[8] = {
    0b10101,
    0b10101,
    0b10100,
    0b10000,
    0b10000,
    0b10000,
    0b10000,
    0b00000
  };
  lcd.createChar(SCALE_CLEAR0, scaleChar0);

  byte scaleChar1[8] = {
    0b11101,
    0b11101,
    0b01100,
    0b01000,
    0b01000,
    0b01000,
    0b01000,
    0b00000
  };
  lcd.createChar(SCALE_CLEAR1, scaleChar1);

  byte scaleChar2[8] = {
    0b10101,
    0b10101,
    0b00100,
    0b00100,
    0b00100,
    0b00100,
    0b00100,
    0b00000
  };
  lcd.createChar(SCALE_CLEAR2, scaleChar2);

  byte scaleChar3[8] = {
    0b10111,
    0b10111,
    0b00110,
    0b00010,
    0b00010,
    0b00010,
    0b00010,
    0b00000
  };
  lcd.createChar(SCALE_CLEAR3, scaleChar3);

  byte scaleChar4[8] = {
    0b10101,
    0b10101,
    0b00101,
    0b00001,
    0b00001,
    0b00001,
    0b00001,
    0b00000
  };
  lcd.createChar(SCALE_CLEAR4, scaleChar4);

  byte scaleChar5[8] = {
    0b10101,
    0b10101,
    0b00100,
    0b00000,
    0b00000,
    0b00000,
    0b00000,
    0b00000
  };
  lcd.createChar(SCALE_CLEAR5, scaleChar5);

  displaybackscale();
  displaySCALE();
}


void displaybackscale()
{
  lcd.setCursor(0, 0);
  for (byte i = 0; i < 12; i ++)
  {
    lcd.write(SCALE_CLEAR5);
  }
}



void loop() {

  DateTime now = rtc.now();
  sec_num = now.second();

  lcd.setCursor(0, 1);
  lcd.print(sec_num);
  lcd.print(" ");

  Serial.println(sec_num, DEC);
  delay(1000);


  displaybackscale();
  displaySCALE();

}


void displaySCALE()
{

  int y = sec_num / 5;

  lcd.setCursor(y, 0);
  level = sec_num;
  if (level == 1 || level == 6 || level == 11  || level == 16 )
  {
    level = 0;
    lcd.write(level);
  } else {
    level += 1;
    lcd.write(level);

  }



  Serial.println(level);


}