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As of late January 2016 I have been using an Adafruit Feather as the board powering the chorder I wear. There are some issues with it when reconnecting to an Android device to which it has already been paired. More often than I like on the phone I find myself having to “forget” the Feather and repair rather than simply reconnect but other than that minor inconvenience it has been working beautifully.

So here is the FeatherChorder, a BLE (Bluetooth Low Energy) Chorder using the Adafruit Feather 32u4 Bluefruit LE

Thec advantage of using this board is that it has both the LiPo charger and the BLE transceiver built in reducing the board count for the chorder from three to one. All that is required is to attach the keys and on/off switch, plug in the battery and then program it over a standard micro usb cable.

Level 3 Headline


Here is the link to the github source:

Download the Latest BLE Build

Thanks to Charles Chen for this version!


  1. an adafruit feather 32u4 bluefruit
  2. 7 keyswitches, I suggest Cherry Red MX switches
  3. a small SPDT switch
  4. a LiPo battery with 2-pin JST-PH connector, I like 350mA, 500mA is probably overkill.
  5. something to hold your keys, see other sections of this site for case ideas. It will work with the 3d_printer_files.

The Chords

Once you grab a copy of the code you can find all the chords in the ChordMappings.h file. Change them as you see fit. They are the same as the chords I use on the spiffchorder with one set of changes - I have added a bunch of android specific chords. Media events, Volume control and the like. I will add a chart here in the not too distant future. In the mean time, the ChordMappings.h file has them.

featherchorder.1456020022.txt.gz · Last modified: 2016/02/20 21:00 by priestdo
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