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--- arduino:lcd [2013/03/28 08:57] – created photonicsguy
+++ arduino:lcd [2014/11/13 10:50] (current) – external edit 127.0.0.1
@@ Line 2: / Line 2: @@
 ===== MJKDZ I2C board from eBay. =====
-  * [[http://www.ebay.ca/sch/i.html?_nkw=IIC+I2C+Serial+Interface+Board+Module+Arduino+LCD+1602+Display|eBay search for board]]
 Notes:
-  * I2C address is actually 0x20, not 0x27
+  * [[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|