http://chorder.cs.vassar.edu/ 2009-11-20T23:34:56-05:00 http://chorder.cs.vassar.edu/ http://chorder.cs.vassar.edu/lib/images/favicon.ico text/html 2009-08-15T20:21:43-05:00 Greg Priest-Dorman http://chorder.cs.vassar.edu/spiffchorder/forside?rev=1250382103&do=diff1250382103 Greg, Mikkel, a spiffchorder (on Greg) and the Staples parking lot that made it all possible Spaceman Spiff’s Chording Keyboard Experiment (or SpiffChorder for short) is an experimental platform for creating a USB chording keyboard. A chording keyboard or wp>Chorded keyboard is an input device where characters can be typed by pressing multiple keys at the same time. A popular design is the 7-key chorder, where one key is used for each of the index finger, middle finger, ring finger and … text/html 2009-07-21T22:59:02-05:00 Greg Priest-Dorman http://chorder.cs.vassar.edu/spiffchorder/hardware?rev=1248231542&do=diff1248231542 The image below shows the schematics for the SpiffChorder hardware. The interface to the USB connection is handled with a few passive components. Since the USB communication is handled by bit-banging in the software, an accurate clock source is needed. A 12.000 MHz crystal provides this. Since the beginning of the SpiffChorder project, the AVR USB stack has been expanded to also work at 16 MHz and 16.5 MHz, but this has not been tested with the SpiffChorder. text/html 2009-05-31T13:45:05-05:00 Greg Priest-Dorman http://chorder.cs.vassar.edu/prespiff_chorders/forside?rev=1243791905&do=diff1243791905 Before I had the spiffchorder I used several different approaches to getting my 7 keys seen as an input device. The 2 which were longest lived were a hardware modification of a commercially available but not wearable chorder and a Linux kernel modification. text/html 2009-05-04T11:40:36-05:00 Greg Priest-Dorman http://chorder.cs.vassar.edu/spiffchorder/using_the_atmega8?rev=1241451636&do=diff1241451636 If you build your SpiffChorder with an ATmega8 instead of the ATmega168 you will need to make one or two changes to the Makefile. You will also need to set the fuses differently when you program the chip. All these changes are documented here. If you like me, build the hex file, then program by using avrdude or some other program directly, or use the usb bootloader then you only need to make the first change below. text/html 2009-03-25T16:18:34-05:00 Greg Priest-Dorman http://chorder.cs.vassar.edu/spiffchorder/2009-03-build?rev=1238012314&do=diff1238012314 We decided to build a few desktop spiffchorders and document the process to make it easier for folks to build their first chorder. Eventually this page will contain start to finish photos and instructions for making a desktop spiffchorder in an old vhs cassette case. Currently, it has some photos of the process. text/html 2009-03-25T15:29:32-05:00 Greg Priest-Dorman http://chorder.cs.vassar.edu/spiffchorder/buildit?rev=1238009372&do=diff1238009372 A few of us are putting together 4 chorders in our spare time over the next few days. This endeavor will be documented March 2009 build project pages. --- Greg Priest-Dorman 2009/03/25 15:14 Hardware Build the electronics Build the interface