I've just gotten hold of a 7 colour RGB LCD 16x2 which I want to use with I2C and be able to change the colours. However I don't know which I2C backpack would be best or which library to use. I have a PCF8574 I2C module which would use the LiquidCrystal_I2C.h but it would not be able to change the colour AFAIK. I have seen a DFRobot library and an Arduifruit library but I think the use different I2c controllers.
Can anyone help?