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Serial I2C LCD Display Adapter

Serial I2C LCD display adapter converts parallel based 16 x 2 character LCD display into a serial i2C LCD that can be controlled through just 2 wires. Adapter uses PCF8574 chip that serves as I/O expander that communicates with Arduino or any other microcontroller by using I2C protocol. A total of 8 LCD displays can be connected to the same two wire I2C bus with each board having a different address. The default i2C address is 0X27 and may be changed to any of the following 0X20~0X27 via soldering A0 A1 A2 pins.

Schematic and sample Arduino code
http://electronics-diy.com/two-wire-i2c-arduino-lcd-display.php

Features
     16 x 2 Character LCD display is controlled via just two wires
     Up to 8 LCD displays with adapters can be connected and controlled by the same two wire I2C bus
     Easy to control using Arduino board
     Compatible with 16 x 2 character LCD displays
     Adapter includes 16-PIN male header connector for soldering to LCD display
     Contrast is adjusted via onboard potentiometer
     Backlight may be turned on/off via jumper
     Standard 5V voltage supply
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