Jill Nolde and I built one last summer. The documentation is sparse, but enough to give you some ideas. On the web page, there are copies of the keymap, and a copy of the .asm code used to run the microcontroller. You'll also want to get a copy of "a2x" if you use UNIX. It will let you use the device right from the X server as a keyboard. It translates the characters coming in from the serial line into X Window events. If you cannot find a2x, I can provide it. We handled the key debounce in a little loop on the microcontroller (Intel 80196). The alphabet is probably the most useful thing to you. We just used Infogrip's alphabet. http://www.etla.net/~willey/projects/chordkey/ Mark PK Shiu <pk@imperial-consulting.com> wrote: : While I wait for the dataegg to come to market, I want to : try to build my own portable chorded keypad. Can anyone : point me to information source on: : 1) the chording standard for the alphabet : 2) any notes/algorithm on debouncing chorded keys : 3) tips and tricks on hardware : 4) pass attempts : I am thinking about something like using the basic stamp : as the controller and have the device output rs323 ascii : so that it emulates a TTY (at least the input part). Yep, pretty close to what we did.
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