Multiple reference to display driver would make difficult to replace it by a new one.

[mgoyard]

For the future versions of LaBox (but let finish the current one)

It could be interesting to foresee the use of another display even not I2C (Now : SSD1306Wire.h)

like this 1.44/1.80
https://www.ebay.fr/itm/1-44-1-8inch-TFT-Full-Color-128x160-128x128-SPI-LCD-Display-Module-for-Arduino/193545945157
which needs :
#include <TFT_eSPI.h> // Graphics and font library for ST7735 driver chip
#include <SPI.h>
TFT_eSPI tft = TFT_eSPI(); // Invoke library, pins defined in User_Setup.h
Reference to display should appear in a single point in order to make the change easy.

[Trusty77]

In the next version, the HMI will be separated from the main part, with a little interface with only basic functions: ConnectWifi, ChangeSpoeed, AddLoco, etc... The caller (DCCpp/Throttles part) dont know how it is printed (or not...), the receiver dont know who emit the message and why.

[mgoyard]

For instance, 1.3" OLED are not so expensive compared to 0.96" used in the current project - both 128x64 (5.5€ / 2.5€ on eBay) .
Where are the modifications to be done to replace the SSD1306 driver by the SH1106 driver used by this other I2C display ?

[Trusty77]

With the current version, only HMI should be modified to change the screen. Nowhere else.