Overview

Needed to provide unified communications, common GND from 2 battery sources and breakout for Gumstix/RoboaudioStix ports.

Details

Unified Communications
Provides a Type-A USB port for computer uplink. Includes simple switch to allow USB to route to any of FFUART, STUART, ATMS0, ATMS1. Includes pullup resistors to minimize disruption during switch-over, and LEDs to indicate traffic.

Common GND
Simple capacitor-smoothing and common hookups for GND.

Breakout
Takes single-row (signal-only) headers from RoboAudioStix and turns them into 3-row headers (signal-VCC5-GND). Includes copious capacitors to limit noise from external sources.

Schematic and Board Files

As of 11/30, PMWiki does not allow upload of .SCH and .BRD files, which are the native formatsd of Eagle. So, I have created PDFs and posted these. I have also included a WinZIP file with the Eagle files, including the "Project" file that glues the two halves together.

The board is designed with the manufacturing limits imposed by the PCB company listed on the sparkfun.com webpage, batchpcb.com. You can get details on the limitations from the BatchPCB FAQ page.

The Schematic file:
Attach:TrinityBotBrain_SCH.pdf

The Board file:
Attach:TrinityBotBrain_BRD.pdf

The Board file (in greyscale, for printing):
Attach:TrinityBotBrain_BRD_GreyScale.pdf
NOTE: I just checked this file, and it appears to be B&W, not GS, meaning you can't tell the difference between top and bottom layers. I'll try to correct, but for now, this file isn't very useful.

WinZIP file with all:
Attach:TrinityBotBrain.zip