text: /*
    LiquidCrystal Library - Hello World
  
   Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
   library works with all LCD displays that are compatible with the
   Hitachi HD44780 driver. There are many of them out there, and you
   can usually tell them by the 16-pin interface.
  
   This sketch prints "Hello World!" to the LCD
   and shows the time.
  
    The circuit:
   * LCD RS pin to digital pin 12
   * LCD Enable pin to digital pin 11
   * LCD D4 pin to digital pin 5
   * LCD D5 pin to digital pin 4
   * LCD D6 pin to digital pin 3
   * LCD D7 pin to digital pin 2
   * LCD R/W pin to ground
   * LCD VSS pin to ground
   * LCD VCC pin to 5V
   * 10K resistor:
   * ends to +5V and ground
   * wiper to LCD VO pin (pin 3)
  
   Library originally added 18 Apr 2008
   by David A. Mellis
   library modified 5 Jul 2009
   by Limor Fried (http://www.ladyada.net)
   example added 9 Jul 2009
   by Tom Igoe
   modified 22 Nov 2010
   by Tom Igoe
   modified 7 Nov 2016
   by Arturo Guadalupi
  
   This example code is in the public domain.
  
   http://www.arduino.cc/en/Tutorial/LiquidCrystalHelloWorld
  
  */
  
  // include the library code:
  #include <LiquidCrystal.h>
  
  // initialize the library by associating any needed LCD interface pin
  // with the arduino pin number it is connected to
  // added per sparkfun tutorial at 
  // https://learn.sparkfun.com/tutorials/basic-character-lcd-hookup-guide
  const int rs = 13, en = 12, d4 = 11, d5 = 10, d6 = 9, d7 = 8;
  LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
  
  void setup() {
    // set up the LCD's number of columns and rows:
    lcd.begin(16, 2);
    // Print a message to the LCD.
    lcd.print("hello, world!");
  }
  
  void loop() {
    // set the cursor to column 0, line 1
    // (note: line 1 is the second row, since counting begins with 0):
    lcd.setCursor(0, 1);
    // print the number of seconds since reset:
    lcd.print(millis() / 1000);
  }
  