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lib/LiquidCrystal_I2C/extras/info/readme.txt

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+// LiquidCrystal_I2C V2.0 - Mario H. atmega@xs4all.nl
+// Mods for Chinese I2C converter board - Murray R. Van Luyn. vanluynm@iinet.net.au
+
+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 Chinese PCF8574 extender.
+4 of the 8 outputs are used for LCD data lines 4 to 7.
+4 outputs are used for the Enable, register-select, Read/Write and backlight control lines.
+
+The Chinese 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 0x27 and the base address for the PCF8574A is 0x4E.
+The examples included in this zip file assume the use of an PCF8574 set for address 0x27 
+(A0, A1 and A3 un-linked, so pulled high).
+
+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
+
+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
+
+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.