Reference

Library

• Library version:1.1
• Arduino Library(compatible with IDE V1.0 and above): https://github.com/johnrickman/LiquidCrystal_I2C
• Library Support Functions:
  • LiquidCrystal_I2C() //set the LCD address for a 16 chars and 2 line display
  • init() //Initialization for the LCD
  • clear() //clear display, set cursor position to zero
  • home() //set cursor position to zero
  • createChar() //Fill the first 8 CGRAM locations with custom characters
  • setCursor() //set the position of the cursor
  • cursor() //Turns the underline cursor on
  • noCursor() //Turns the underline cursor off
  • blink() //Turn on the blinking cursor
  • noBlink() //Turn off the blinking cursor
  • display() //Turn the display on(quickly)
  • noDisplay() //Turn the display 0ff(quickly)
  • backlight() //Turn the backlight on
  • noBacklight() //Turn the backlight off
  • scrollDisplayLeft() //Make the display scroll left without changing the RAM
  • scrollDisplayRight() //Make the display scroll right without changing the RAM
  • autoscroll() //This will 'right justify' text from the cursor
  • noAutoscroll() //This will 'left justify' text from the cursor
  • leftToRight() //This is for text that flows Left to Right
  • rightToLeft() //This is for text that flows Right to Left

Communication Protocol Description

I2C Address Setting

• 0: The Jumper Cap is connected
• 1: The Jumper Cap is disconnected

The default address is 0x20. All the jumper caps will be connected from the factory.

API Description

• LiquidCrystal_I2C() //set the LCD address for a 16 chars and 2 line display
• init() //Initialization for the LCD
• clear() //clear display, set cursor position to zero
• home() //set cursor position to zero
• createChar() //Fill the first 8 CGRAM locations with custom characters
• setCursor() //set the position of the cursor
• cursor() //Turns the underline cursor on
• noCursor() //Turns the underline cursor off
• blink() //Turn on the blinking cursor
• noBlink() //Turn off the blinking cursor
• display() //Turn the display on(quickly)
• noDisplay() //Turn the display 0ff(quickly)
• backlight() //Turn the backlight on
• noBacklight() //Turn the backlight off
• scrollDisplayLeft() //Make the display scroll left without changing the RAM
• scrollDisplayRight() //Make the display scroll right without changing the RAM
• autoscroll() //This will 'right justify' text from the cursor
• noAutoscroll() //This will 'left justify' text from the cursor
• leftToRight() //This is for text that flows Left to Right
• rightToLeft() //This is for text that flows Right to Left

Other Supplementary Information

LCD datasheet
PCA8574 Datasheet