Make a little * dance across your Grove LCD screen using JavaScript on the Intel Edison or Intel Galileo. Video: https://twitter.com/PearlChen/status/587808490405625856

intel-edison-grove-lcd-Jhd1313m1-example

var mraa = require ('mraa');
/*
If you get any mraa missing errors, run this on your board:
$  echo "src mraa-upm http://iotdk.intel.com/repos/1.1/intelgalactic" > /etc/opkg/mraa-upm.conf
$  opkg update
$  opkg install libmraa0
*/

var LCD  = require ('jsupm_i2clcd');
/*
If you get any upm missing errors, run this on your board:
$  opkg install upm
*/

// Initialize the LCD. The 1st param is the BUS ID.
//   Intel Edison: Use 6
//   Intel Galileo Gen 2: Use 6 (unconfirmed)
//   Intel Galileo Gen 1: Use 0
var myLCD = new LCD.Jhd1313m1(6, 0x3E, 0x62);

var LCD_MESSAGE = "*";
var LCD_COLUMNS = 16;
var LCD_ROWS = 2;
var row = 0;
var column = 0;

updateLcd();

function updateLcd(){

  // write message to LCD at cursor position
  // plus update column variable while we're at it
  myLCD.setCursor(row, column++);
  myLCD.write(LCD_MESSAGE);
  
  // figure out if * is at end of row, and reset if needed
  if (column == LCD_COLUMNS) {
    column = 0;
    row = ( row == 1 ? 0 : 1);
  }
  
  //note: anything below a 100-200ms refresh rate is a bit too blurry
  setTimeout(clearLcd, 200);
}

function clearLcd(){
  
  // wipe out any chars on the LCD screen
  myLCD.clear();
  
  // if you try to clear the LCD and update immediately, you get nuthin'
  // so use a setTimeout as a delay 
  setTimeout(updateLcd, 30);
}