Single sided daughterboards for breadboard prototyping



I like to build the first prototypes of electronic systems using the breadboard - it spares money and time. However with new integrated circuits it is often impossible. They are enclosed in TQFP or BGA cases which do not fit into the breadboard. Some essential connections (e.g. to clock generator, or to USB conector) also should not be done via breadboard to preserve signal integrity.
For such chips I usually design and use small daughterboards ("breakout boards") which implement all necessary high speed connections or decoupling capacitors, and make all other pins available for the breadboard.

Currently the following daughterboards are available:

Daughterboard for ATmega32U2

To allow using the ATmega32U2 on the breadboard I've designed a simple daughterboard. There are other similar daughterboards available (e.g. "ATmega32U2 USB Development Board" or USB Breakout, so why have I designed yet another one?
My design has been optimized for single-sided PCB, which almost everyone is able to produce herself or himself using the thermo-transfer method. The board is designed with Kicad suite.
The complete project is available for download.
My part of design is published as public domain, however the project contains also some symbols/modules from open source libraries published by Opendous Inc. (as described here) under another license:
opendous.dcm, opendous.lib, opendous.mod, and opendous.mdc are By Opendous Inc.
and Copyright Under the Creative Commons Attribution License: http://creativecommons.org/licenses/by/3.0/
 Also wrl models included in the project are based on the original Kicad 3D models, so probably they are published under GPL
Please note, that this is a free, public domain design, so there is no warranty of any kind!

Daughterboard for ATmega32U4

To allow using the ATmega32U4 on the breadboard I've designed a simple daughterboard. There are other similar daughterboards available (e.g. "Atmega32u4 Breakout+" or Teensy, so why have I designed yet another one?
My design has been optimized for single-sided PCB, which almost everyone is able to produce herself or himself using the thermo-transfer method. The board is designed with Kicad suite.
The complete project is available for download.
Please note, that the board is single-sided, even though there are two tracks on the front side. They should simply be replaced with wires.
My part of design is published as public domain, however the project contains also some symbols/modules from open source libraries published by Opendous Inc. (as described here) under another license:
opendous.dcm, opendous.lib, opendous.mod, and opendous.mdc are By Opendous Inc.
and Copyright Under the Creative Commons Attribution License: http://creativecommons.org/licenses/by/3.0/
 Also wrl models included in the project are based on the original Kicad 3D models, so probably they are published under GPL
Please note, that this is a free, public domain design, so there is no warranty of any kind!

Daughterboard for CS5343/CS5344

This daughterboard integrates CS5343/4 chip with required decoupling capacitors and with "charge source" capacitors on the inputs of ADC. It allows to use the CS5343/4 chip in a breadboard based prototype, keeping noise at reasonable level. Complete project in the KiCad format is available for download.
Please note, that this is a free, public domain design, so there is no warranty of any kind!