GTA04-Custom: EAGLE schematics and board file blueprint for developing expansion/adapter boards

Dr. H. Nikolaus Schaller hns at
Thu Mar 1 11:11:51 CET 2012

The GTA04 is not only designed as a motherboard replacement for the Openmoko devices,
but also as a "core module" to easily develop other devices from it.

We now have released the schematics and board file of such an expander board
(EAGLE 5.x format). It is designed to carry a 3.5 inch VGA touch screen from Ortustech
(formerly Casio):

It is a stripped down version of the sample device that we have built:

The principle of making your own PDA, Tablet, etc. is simple:

design a 2 layer 150 um (6 mil) board based on the blueprint and
have it produced where you like.

Then plug in a GTA04 custom board that carries the B2B connectors instead of the 39 pin
ZIF connector for the Openmoko display and mount everything by three 2mm plastic screws.

We are now planning to produce some of the Custom boards and need your comments
and wishes (please note that we can't add functions to the GTA04, we can only remove some
but you can add what you like to your adapter board).

And, if you have ideas which adapters (the BeagleBone community calles them "capes")
you would like to build, please let us all know. This may trigger others for new ideas.

Now I am curious who will be the first to come up with a GTA04 Tablet :)


PS: if someone is interested in our sample device, please contact me. We are now
able to produce more of them (even in different colors), incl. display, case and
3900 mAh battery.

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