An update ... but I'm still not there ...
I found that I use the following library: LiquidCrystal_SI2C ... and this library exists and is compiling.
To determine the pins, it says to edit the SI2CIO.cpp file and specify the pins and ports.
I've tried:
Analog Pins 0/1:
#define SDA_PIN 0
#define SDA_PORT PORTC
#define SCL_PIN 1
#define SCL_PORT PORTC
Analog Pins 2/3:
#define SDA_PIN 2
#define SDA_PORT PORTC
#define SCL_PIN 3
#define SCL_PORT PORTC
Digital Pins 10/11:
#define SDA_PIN 2
#define SDA_PORT PORTB
#define SCL_PIN 3
#define SCL_PORT PORTB
And I can get nothing to work.
I have the display working with the standard Analog pins 4/5, but even trying those with the "SoftI2C" does not work.
Anyone have experience with this?