Here is a project that uses our 128x64 Graphic Display / User Interface for the RPI 3.
The user interface module has a 1.4" LCD, three pushbuttons (UP, DOWN, ENTER) and a bi-color (Red/Green/Amber) LED for status indication.
To operate off the RPi 3, the display interface is resource heavy: it uses a total of 19 GPIO lines!
- 8 for LCD data bus
- 5 for LCD control lines
- 1 for LCD backlight
- 2 for Status LED
- 3 for Push Buttons
The test software is written in "C" using the Geany compiler. The software features:
- 7 lines of display
- Font table 6x8
- Programmable LEFT or CENTER Justification
- Programmable Character Height (1 line or 2 lines)
- Programmable Character Width (Standard or Double)
The hardware used is the RPI 3, the Pi-SPi-PROTO prototype pcb, and the WL-ERC12864 KIT. The only other components added are three 10K ohm pullup resistors for the push button lines.
In development is a add on module to the Pi-SPi line that uses GPIO expanders to minimize the number of GPIO lines required - the new module will use the SPI bus and 2 chip selects. This design will be more practical for real world applications.
The sample code for the above is available to anyone interested, just drop us a line at info@widgetlords.com.