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

String Version = "V 2018-03-09 36";
int I2CAddr = 0x3F;

//LiquidCrystal_I2C lcd(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
LiquidCrystal_I2C lcd(I2CAddr, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);

byte backslash[8] = { 0b00000,
                    0b10000,
                    0b01000,
                    0b00100,
                    0b00010,
                    0b00001,
                    0b00000,
                    0b00000 };
  
void setup() {
  // open the Serial port
  Serial.begin(57600);
  Serial.println("Display bespielen");
  Serial.println(Version);
  Serial.print("Adresse dez: ");
  Serial.println(I2CAddr);
  delay(500);

  lcd.begin(16,2);    // initialize the lcd
  lcd.createChar(0, backslash); //das Byte-Array in den LCD-Speicher 0 schreiben
  // Cursor Position: CHAR, LINE) start at 0  
  lcd.setCursor(0,0); //Start at character 0 on line 0
  // lcd.print("Serial Radio mk ");
  lcd.print(" Display testen ");
  lcd.setCursor(0,1);
  lcd.print(Version);
  delay(1000);
  lcd.setCursor(0,1);
  lcd.print("                ");
}

int TurnDelay = 500;
unsigned long Start = 0;

void loop() {
  turn();
  DisplayTime();
  delay(1000);
} // loop

void turn() {
  lcd.setCursor(0,1);
  lcd.print("/ ");
  lcd.write((uint8_t)0 );
  delay(TurnDelay);
  lcd.setCursor(0,1);
  lcd.print("- -  ");
  lcd.print(TurnDelay);
  delay(TurnDelay);
  lcd.setCursor(0,1);
  lcd.write((uint8_t)0 );
  lcd.print(" /");
 // lcd.print((char)245);
 // lcd.print("\\");
  delay(TurnDelay);
  Start = millis();
  lcd.setCursor(0,1);
  lcd.print("| |");
  Serial.print(millis());
  Serial.print(" - ");
  Serial.println(millis() - Start);
  delay(TurnDelay);
  TurnDelay = TurnDelay + 5;
}

void DisplayTime () {
  long WriteDisplay = millis();  // test
  long int RunTime = millis() / 1000;  // links Laufzeit in hh:mm:ss ausgeben
//  RunTime = RunTime + 3550;
  int hr = 0;
  int min = 0;
  int sek = 0;
  do {  // Stunden errechnen
    if ((RunTime - 3600) >= 0) {
      RunTime = RunTime - 3600;
      hr ++;
    }
  }
  while (RunTime > 3599);

  do {  // Minuten errechnen
    if ((RunTime - 60) > -1) {
      RunTime = RunTime - 60;
      min ++;
    }
  }
  while (RunTime > 59);

  sek = RunTime;  // restliche Sekunden

 // String LCD_Line1 = "";
  char LCD_Line1[16];
  sprintf(LCD_Line1, "%02d:%02d:%02d", hr, min, sek);

/*  if (hr < 10) {
    LCD_Line1 = LCD_Line1 + "0";
  }
  LCD_Line1 = LCD_Line1 + String(hr) +":";

  if (min < 10) {
    LCD_Line1 = LCD_Line1 + "0";
  }
  LCD_Line1 = LCD_Line1 + String(min) +":";

  if (sek < 10) {
    LCD_Line1 = LCD_Line1 + "0";
  }
  LCD_Line1 = LCD_Line1 + String(sek) +" Stunden";
*/
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print(LCD_Line1);

/*  if (hr < 10) {
    lcd.print("0");
  }
  lcd.print(hr);
  lcd.print(":");
  if (min < 10) {
    lcd.print("0");
  }
  lcd.print(min);
  lcd.print(":");
  if (sek < 10) {
    lcd.print("0");
  }
  lcd.print(sek);
*/
  int Dauer = millis() - WriteDisplay;  // test
  lcd.setCursor(0,1);
  lcd.print("Dauer write: ");
  lcd.print(Dauer);
  lcd.print(" ms");

} // Ende DisplayTime

// End.