Pi RAQ RT Wiki

What Is It: Welcome to the EarthLCD Pi-RAQ-RT wiki! The Pi-RAQ-RT is the easiest way to create a 1U touchscreen internet appliance with a brilliant 10 inch x 1 inch (1024 x 100 pixel) color TFT touch screen. Available as a complete unit or any of the parts to build your own it is working it's way into audio, VOIP telephony, broadcast, network and DIY applications.

Who Did This: The Pi-RAQ is the brainchild of EarthLCD and Ken segler aka codeman.

Why We did it: EarthLCD bought a large inventory and tooling for the LCD used in the Keyview Smartype keyboard. When Randy Schafer EarthLCD CEO saw it he knew it was perfect for 1U rackmount equipment use.

How It Works: The display is connected to the IO header on the Raspberry Pi, the pins are reconfigured to DPI Mode (Digital Panel Interface) using two files on the SD Card. That is done using a file (Device Tree) on the SD Card, under Raspbian wheezy the file was named dt-blob.bin and is located on the boot section of the SD Card, under Raspbian Jessie the file is now in the overlays directory and is named PiRaq.dtbo. Next is the changes made to the config.txt file on the SD Card that tells the Operating System what display resolution we are using.

dtoverlay=PiRaq

framebuffer_width=1024

framebuffer_height=100

hdmi_timings=1024 0 25 50 25 100 0 2 10 2 0 0 0 30 0 35000000 7

enable_dpi_lcd=1

display_default_lcd=1

dpi_output_format=6488594

dpi_group=2

dpi_mode=87