My mods for GY II2CLCD backpack and C++ify the code a little.
Drive a HD44780 based LCD via I²C on Raspberry Pi - with just two pins. I have used PCF8574 I²C bus expander Chip for this purpose. This helps limited number of Raspberry Pi's pins to be better utilized. The best part is, those two pins also can be re-used because they are I²C pins, you can connect upto 127 additional devices.
Please take note that this code is based on the code posted by ufux at https://gist.github.com/ufux/6094977.
Schematics : https://raw.githubusercontent.com/karunadheera/lcdpcf8574/master/lcdpcf8574.png : https://raw.githubusercontent.com/karunadheera/lcdpcf8574/master/lcdpcf8574.svg
