ubermick:
But the guesser says that the backpack has to be NOT connected to the LCD screen in order for it to work?
- hookup the i2c backpack and only the i2c backpack to the Arduino (make sure to use the needed pullup resistors - i2c needs them to work correctly)
That means that you must have no other I2C devices connected to the Arduino. You must have the display connected to the backpack otherwise how will you tell when the proper constructor has been guessed?
* When the correct configuration is guessed,
* the LCD will display the constructor
Don