====== LCD Display ======

===== MJKDZ I2C board from eBay. =====
Notes:
  * [[http://www.ebay.ca/sch/i.html?_nkw=IIC+I2C+Serial+Interface+Board+Module+Arduino+LCD+1602+Display|eBay search for board]]
  *   * I2C address is actually 0x20, not 0x27
  * I'm using the [[https://bitbucket.org/fmalpartida/new-liquidcrystal/wiki/Home|New LiquidCrystal]] library
  * Need pull-up resistors on SDA and SCL lines (A4 & A5 pins)
Test Code
<code c LCD_test.ino>#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

#define lcdAddr 0x20 // set the address of the I2C device the LCD is connected to
// create an lcd instance with correct constructor for how the lcd is wired to the I2C chip
LiquidCrystal_I2C lcd(lcdAddr, 4, 5, 6, 0, 1, 2, 3, 7, NEGATIVE); // addr, EN, RW, RS, D4, D5, D6, D7, Backlight, POLARITY

void setup()
{
  lcd.begin(16,2);  // initialize the lcd as 20x4 (16,2 for 16x2)
  lcd.clear();
  //  lcd.home ();
  //  lcd.print("123456789012345678");
  //  lcd.setCursor (0,1);
  //  lcd.print("ABCDEFGHIJKLMNOP");

  lcd.setCursor (0,0);
  lcd.print("Count:");
  lcd.setBacklight(1);
}

int i=0;
void loop()
{
  lcd.setCursor (7,0);
  lcd.print(i++);
  delay (100);

}</code>


Note: [[http://www.rpiblog.com/2012/07/interfacing-16x2-lcd-with-raspberry-pi.html|Code for Raspberry PI]]

===== Special characters for the HD44780 =====
^Hex^Character^
|0xE4|micro|μ|
|0xF4|Ohm|Ω|
|0xDF|degree|º|