I have been using a chorder built using the Adafruit Feather 32u4 Bluefruit LE. This version of the chorder is documented in the FeatherChorder section of this wiki. The board has the LiPo charger and BLE transceiver built in, so all that is required is attaching the keys, an on/off switch, plugging in the battery and programming it (over a standard micro usb cable). For a schematic and more details please check out FeatherChorder.
Download the Latest BLE Build
The Bluetooth version of the chorder I used prior to the BLE version above. Unless you need a non-BLE solution this has been superceded by the FeatherChorder. Download then rename to btchorder_rawkeys.pde
Download the 2013 BT Build
This is the current release of all the code for the spiffchorder.
Any new releases will appear first at http://sourceforge.net/projects/spiffchorder/ and shortly there after be mirrored here.
Download the Latest USB Build
SpiffChorder-0.99.zip (stable) released. Version 0.99 - released 2012-01-25 ---------------------------------- Changes since 0.98: * Included (patched) USBaspLoader in distribution. * Included patch from Christian Starkjohann for better hardware portability. * Changed to GNU GPL v3 license. * Updated to latest V-USB driver (vusb-20120109.zip). * Moved code to sourceforge.net.
Download the Previous Build
$Id: license.txt 10 2008-03-07 20:50:44Z $ Spaceman Spiff's Chording Keyboard Experiment is based on the HIDkeys application of Objective Development Software GmbH, and their distributed AVR-USB firmware only driver. The directory usbdrv contains the driver and available license etc. in unmodified form. The license for the USB driver requests full disclosure of circuit diagrams and source code, and while other licences are possible, the additional requirements of requiring redistribution of any derivative work is not only acceptable, but highly appreciated. The remaining parts of this project will therefore be published under the same license, which is listed below for reference. Hopefully this will allow further development of applications based on the AVR-USB driver, and inspire others to share their work in a similar fashion. The OBDEV license is listed below. PREFACE Conceiving and understanding a new license is not an easy task. To make things easier for both, the author and the licensee, we have decided to base our license for the USB driver on an existing license with well-understood properties. Our favorite choice for the base license was the GNU General Public License (GPL). However, we cannot use the GNU GPL directly for the following reasons: (1) It was not intended for projects involving hardware -- we must extend the term "source code" to at least the circuit diagram. (2) The GNU GPL does not require publication. Only if a binary is published, it requires that the source is published as well. This is reasonable for software because unpublished software is of little relevance. For projects involving hardware, we want to REQUIRE publication. More than that, we even want to define HOW the publication must be done (files contained, file formats etc). (3) As the author of the software, we can distribute it under more than one license. For people who don't want to meet the obligations of the GNU GPL, we want to offer commercial licenses. To avoid a split in revisions of the driver, we need special privileges to distribute contributed modifications under proprietary licenses. We can not simply modify the GNU GPL and incorporate our changes because the Free Software Foundation (FSF) who holds the copyright for the text of the GNU GPL does not allow modifications. We therefore set up our own small license which incorporates the GNU GPL by reference: LICENSE FOR PROJECTS BUILT WITH "OBJECTIVE DEVELOPMENT'S FIRMWARE-ONLY USB-DRIVER FOR ATMEL'S AVR MICROCONTROLLERS" Version 2006-01 I. Definitions "OBDEV" shall mean OBJECTIVE DEVELOPMENT Software GmbH or any legal successor thereof. "Software Source Code" shall mean the preferred form of the software for making modifications to it. "USB Driver" shall mean the Software Source Code for OBDEV's firmware-only USB-driver for Atmel's AVR microcontrollers. "Function" shall mean the Software Source Code for all software executed on the microcontroller except the USB Driver. "Host Software" shall mean the Software Source Code for all software required to control the USB device from the USB host running any operating system. "Project" shall mean the USB Driver, the Function, the Host Software, circuit diagrams of the controller based hardware and accompanying documentation. "source code" shall have the same meaning as the term "Project" above. "Web Site" shall mean a collection of text and multimedia documents accessible worldwide over internet through the HyperText Transfer Protocol (HTTP) on TCP port 80 (standard HTTP port). II. General License Terms The general terms of this license consist of the GNU General Public License Version 2 (GNU GPL2) which is hereby incorporated into this section as though it were fully set forth here. A copy of the GNU GPL2 is included for your convenience in appendix A of this license. The term "source code" in the GNU GPL2 is to be understood as defined in section I above. If any term or definition in section I, III, IV or V conflicts with the GNU GPL2, the term or definition in section I, III, IV or V has precedence of the GNU GPL2. III. Distribution of the Project The distributed form of a Project must contain at least the following files: (a) Software Source Code files for the USB Driver, the Function and the Host Software. (b) Circuit diagrams for the hardware in PDF, PNG or GIF image file format. (c) A file with name "Readme.txt" in ASCII format with at least the following content (in English language): - An explanation what the Project does. - What to do with the distributed files (installation procedure etc.). - A reference to Objective Development's USB driver. - Your (author's) name and contact information. E-mail and/or URL is sufficient. (d) Optionally a text file with a description of the circuit diagram, an explanation of special (software) techniques used etc. (e) A copy of this license in a file with the name "License.txt". This copy can be in the "usbdrv" subdirectory which contains the driver. IV. Requirement for Publication All modifications and derived work (Projects using the USB Driver) MUST be distributed (published) as described in section III above on a Web Site. The main page must reproduce at least a description of the Project (e.g. as contained in the "Readme.txt" file distributed) and a download link for the entire Project. The URL of the main page must be submitted to OBDEV. OBDEV will provide a mechanism for submitting Project URLs and for publishing Projects on their Web Site. The Project must remain available for at least twelve (12) months after the initial publication or at least six (6) months after a subsequent version of that particular Project has been published. V. Author Privileges OBDEV reserves the right to distribute the USB Driver and all modified versions under other (proprietary) licenses. If you modify the USB Driver under the grants of this license, you therefore grant OBDEV (in addition to the grants of the GNU GPL2) a worldwide, perpetual, irrevocable royalty free license for your modifications. OBDEV shall not automatically gain rights other than those of the GNU GPL2 in the other parts of the Project. This section V overrides possibly contradicting terms in the GNU GPL2 referenced in section II. APPENDIX A GNU GENERAL PUBLIC LICENSE Version 2, June 1991 Copyright (C) 1989, 1991 Free Software Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The licenses for most software are designed to take away your freedom to share and change it. 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The "Program", below, refers to any such program or work, and a "work based on the Program" means either the Program or any derivative work under copyright law: that is to say, a work containing the Program or a portion of it, either verbatim or with modifications and/or translated into another language. (Hereinafter, translation is included without limitation in the term "modification".) Each licensee is addressed as "you". Activities other than copying, distribution and modification are not covered by this License; they are outside its scope. The act of running the Program is not restricted, and the output from the Program is covered only if its contents constitute a work based on the Program (independent of having been made by running the Program). Whether that is true depends on what the Program does. 1. 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