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digistump-sam/libraries/DigiXLCD/info/notes_for_pollin_interface.txt

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+Notes for users with a Pollin.de interface board
+http://www.pollin.de/shop/dt/NDU4OTgxOTk-/Bausaetze_Module/Bausaetze/LCD_I2C_Modul.html
+
+The pollin interface board will not work with de default library.
+To get it working two control lines to the LCD need to be changed.
+
+Open file "LiquidCrystal_I2C.h" with a text editor like Notepad (not WordPad !)
+ 
+In that file look for:
+#define En B00010000  // Enable bit
+#define Rw B00100000  // Read/Write bit
+#define Rs B01000000  // Register select bit
+
+Replace these lines by:
+#define En B01000000  // Enable bit
+#define Rw B00100000  // Read/Write bit
+#define Rs B00010000  // Register select bit
+
+
+
+People at Pollin also have misunderstood the PCF8574 Datasheet and list the wrong addresses on their PCB
+For PCF8574A the addressing is:
+				
+Jp3	Jp2	Jp1		
+A2	A1	A0	Dec	Hex	
+L	L	L	56	0x38
+L	L	H	57	0x39
+L	H	L	64	0x40
+L	H	H	74	0x4A
+H	L	L	75	0x4B
+H	L	H	76	0x4C
+H	H	L	77	0x4D
+H	H	H	78	0x4E
+
+They also seem to ship boards with a PCF8574
+For PCF8574 the addressing is:
+
+Jp3	Jp2	Jp1		
+A2	A1	A0	Dec	Hex	
+L	L	L	32	0x20
+L	L	H	33	0x21
+L	H	L	34	0x22
+L	H	H	35	0x23
+H	L	L	36	0x24
+H	L	H	37	0x25
+H	H	L	38	0x26
+H	H	H	39	0x27
+
+
+They have also chosen two rather high pull-up resistors (10K) for the I2C lines. Usually two 4K7 resistors should do the job.
+Please note that on a I2C bus only one device should have the pull-up resistors installed!
+
+I hope this helps in getting your LCD working.
+
+Mario

digistump-sam/libraries/DigiXLCD/info/readme.txt

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+LiquidCrystal_I2C V2.0
+
+The LiquidCrystal_I2C library is a modified version of the standard LiquidCrystal library as found on 
+the Arduino website.
+This library is intended to be used when a parallel HD44780 compatible LCD is controlled over I2C using 
+a PCF8574 extender (see datasheet for details).
+4 of the 8 outputs are used for LDC data lines 4 to 7.
+3 outputs are used for the Enable, register-select and Read/Write lines.
+The one output left can be used to control the backlight of the LCD (if available).
+For backlight control some extra resistors and a pnp-type transistor are required (for details see 
+schematic diagram).
+
+The PCF8574 extender is available in two versions, the PCF8574 and the PCF8574A.
+The only difference between the two is the I2C base address.
+The base address for the PCF8574 is 0x20 and the base address for the PCF8574A is 0x38.
+The examples included in this zip file assume the use of an PCF8574 set for address 0x20 
+(A0, A1 and A3 grounded).
+
+For compatibility reasons this library contains some aliases for functions that are known under different 
+names in other libraries. This should make it fairly easy to implement the library in existing sketches 
+without changing to much code.
+Functions not supported by this library will return nothing at all and in case a return value is expected 
+the function will return 0.
+
+Update 8-12-2011:
+Due to the relaese of Arduino IDE 1.0 some changes were made to the library to get it working under the new IDE.
+Because of these changes this version of the LiquidCrystal_I2C library can not be used for older IDE versions.
+The old version of the LiquidCrystal_I2Clibrary can be downloaded form http://www.xs4all.nl/~hmario/arduino/LiquidCrystal_I2C/V1.0/LiquidCrystal_I2C_V1.0.zip
+
+Download the latest version from:  
+http://www.xs4all.nl/~hmario/arduino/LiquidCrystal_I2C/LiquidCrystal_I2C.zip
+(Thanks to Ailton F. for beta testing.)
+
+
+Mario H.
+atmega@xs4all.nl