2015-10-28 (W) Wrist Mounted Chording Keyboard

A photo area was set up with a large piece of white foam board and two strong lights. The primary light was a 500 watt halogen work light with warm light. The secondary light, for fill lighting, was a full spectrum light. Identical work lights have been used in the past. Isolated pictures were desired for the photos so labels could be attached.

Photo area

Some of the pictures had the background removed. Taking the pictures with high light intensity made removing the background easier. The photos were over-exposed to wash out the white background so it could be easily cropped away. Over-exposing was done on a camera phone by holding a dark piece of material over a portion of the photo area so the camera would adjust the settings for the dark area then pulling the material away before taking the picture. Manual settings on a digital camera would have made the procedure easier by adjusting the f-stop and shutter speed.

Lists of parts were made for each portion of the project, Keyboard, wrist mounted rig, wrist controller and proximity switch. Each list was a compilation of the parts which would be printed and the parts which should be purchased. Some items, like switches, can be substituted to the maker’s liking. If someone wanted to use the code for the keyboard with a desk mounted keyboard it would work fine and could still utilize the Bluetooth if desired.

Parts list with links

 To do:
  • Program changes
    • Servo shouldn't rest
    • Make sure travel limits are within the bounds of the physical movement
    • Lights transition as servo moves
  • Write instructions 
    • Take photos of parts to be isolated
    • Isolate photos
    • Compress and link to all files
      • OpenSCAD files
      • STL models
      • Arduino code 
    • Name everything and use name uniformly throughout instructions 
    • Make diagram with every part labeled 
    • Schematic for servo controller and proximity switch
The rest of the posts for this project have been arranged by date.

First time here?
Completed projects from year 1.
Completed projects from year 2.

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2015-10-27 (Tu)


  1. An interesting wash out technique to avoid using Photoshop! Whatever is simplest, to enable more actual content, vs fiddling around with graphics! They do the job intended..

  2. I still use GIMP to take out the background although it's not entirely necessary. If there's lots of shadows it doesn't look as clean or it takes FOREVER. This way I can isolate the subjects in a couple of commands instead of doing it by hand all day.


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