A library for driving LiquidCrystal displays (LCD) by using the I2C bus and an PCF8574 I2C adapter. There are modules that can be soldered or stacked to the display that offers an I2C interface for ...

Currently FPP has support for a 20x4 or 16x2 LCD display utilising the PCF8574 GPIO driver chip. Looking at the code, this appears to be using i2c address 0x3f, which is in the range for the PCF8574A ...