In this recipe, our peripheral device—an LCD screen—is connected to the board over the I2C bus. It is a form of a serial interface, so the connection only requires four physical wires. An LCD screen, however, can do much more than a simple LED. This means that the communication protocol used to control it is also more complex.
We will use only a fraction of the functionality provided by the 1602 LCD screen. The communication logic is loosely based on the LiquidCrystal_I2C library for Arduino, adapted for Raspberry Pi.
We define an Lcd class that hides all the complexities of I2C communication and the specifics of the 1602 control protocol in its private methods. Besides a constructor and a destructor, it exposes only two ...
