RetroBSD can run on a variety of boards (see Unix on your breadboard), but if you need an Arduino form factor - Duinomite is definitely a good choice.



For technical details, see page: https://github.com/RetroBSD/retrobsd/wiki/Board-Olimex-Duinomite

LCD4884 shield is a pretty easy way to add a simple GUI interface to your Arduino project. The shield is available from SainSmart and Amazon; a few clones exist on Ebay.

LCD part of the shield works fine with both 5V and 3.3V boards. Joystick needs some modification to make it 3.3V compatible:

Cut off 5V pin on the Arduino power connector (on the bottom side).

Solder 5V pin to 3.3V pin on the Arduino power connector (on top of the board).

Signals of LCD shield are connected to PIC32 microcontroller as shown in the table:

Signal Function PIC32 D2 SPI_SCK RE2 D3 SPI_MOSI RE3 D4 LCD_DC RE4 D5 SPI_CS RE5 D6 LCD_RST RE6 D7 LCD_BL RE7 A0 KEY_IN RB3

SPi interface is compatible with Philips PCD8544 (data sheet).

Joystick buttons are connected to a series network of resistors: GND -- 3.3k -- 1k -- 620 -- 330 -- 2k -- VCC. See schematics here (PDF). When one of buttons is pressed, output voltage is defined by resistor divider: