LCD Display

The LCD display on the Dwengo board is a 16x2 character display with backlight. This display uses a frequently used HD44780 compatible controller.

This table shows the standardised pin configuration for the 16-pins connector of these frequently used displays.

   Pin   Function   Dwengo board      Description
     1      GND      GND
     2      Vcc      +5V
     3      V0       Trimmer TR1       Contrast adjustment
     4      RS       RE0               Register select: low = instruction, high = data
     5      R/W      RE1               Low = Write, High = Read
     6      E        RE2               Enable (active high)
     7      DB0      RD0               Data-bus bit 0 (not used in 4-bit mode)
     8      DB1      RD1               Data-bus bit 1 (not used in 4-bit mode)
     9      DB2      RD2               Data-bus bit 2 (not used in 4-bit mode)
    10      DB3      RD3               Data-bus bit 3 (not used in 4-bit mode)
    11      DB4      RD4               Data-bus bit 4
    12      DB5      RD5               Data-bus bit 5
    13      DB6      RD6               Data-bus bit 6
    14      DB7      RD7               Data-bus bit 7
    15      LED+     +5V               Positive backlight supply
    16      LED-     RC0 (through T1)  Negative backlight supply

The display is easy to use by means of the "lcd.h" library which was developed for the Dwengo board. This library ensures that the display is initialised correctly and it provides some handy intuitive functions for writing text to the display. More information about using the display can be found in the LCD tutorial.