ESP32 HD44780 driver/library

This is a header-only C++ style library (see files in main/include/) for driving the popular HD44780 LCD display from an ESP32 microcontroller. Currently, there exist two Interfaces - one using PCF8574 expander via I2C and one using 4-bit GPIO connection. Feel free to suggest or write other Interfaces (like for other expanders, or full 8-bit 12-pin communication).

Main source file contains simple tests. You can see the results here. See performance here.

Installation & usage

See example in main/main.cpp.

• Move the files from main/include/ to your include directory.
• #include the HD44780.h and PCF8574.h or GPIO4BIT.h in your code.
• Create HD44780_PCF8574 or HD44780_GPIO4BIT object.
• Create HD44780 object with the earlier Interface object.
• Done!