This is an old revision of the document!
Welcome to Chorder
This website contains information on building and using a home made 7 key chording keyboard.
I have been using this device or one of its predecessors since the mid 1980's, by 1995 it has been a full function chorder and my primary keyboard with my phone, Herbert my wearable computer, and conventional desktop machines. There are both USB and BLE1) versions robust enough for daily use. The current version of the USB chorder (SpiffChorder Project) is detected as a normal USB keyboard by the host computer. This was made possible through the work done by Mikkel Holm Olsen. The BLE version (FeatherChorder) was coded in 2015-2016 as an upgrade of the earlier BT version.
As of 2025 with the help of some friends we are working on a new USB version and a combined BLE and USB version. They will be here once ready! If you want to build and test either of these before then, please contact me.
Some of the instructions found here involve using sharp tools and soldering irons. We make no claims as to the safety of such activities.
Each project lists contact information for the person who created or maintains it. Please use that information when inquiring about a particular project. But if you can't reach them, write me.