2015-10-25 (Su) Wrist Mounted Chording Keyboard

A second emitter-receiver tube was printed. This tube was identical to the first. Instead of desoldering the first tube and attaching a different cord a second was made entirely new so the first could be reused in another project in the future. Protoboard was attached to the wires and soldered in place then cut to size.

New Ethernet cord was salvaged which felt more flexible. The sheathing over the wires was softer and the insulation over the copper was more pliable. Strangely, the wire inside turned out to be solid as opposed to stranded. Stranded wire tends to conduct better and be more flexible.

Salvaged Ethernet wire and soldered protoboard

When the wires were soldered in place the sheathing was pulled over the wires to hide as much as possible and pull the wire out of the other end so it could be attached to the screw terminals in the control enclosure. Wires were attached neatly and orderly this time. Last time they were attached with numerous bends and unnecessary lengths. Care was taken to arrange the Ethernet cord so it could exit the enclosure in line with the row of terminals.

Wires soldered to protoboard

Sheath pulled over exposed wires

Wires arranged neatly in terminal strip

To do:
  • Reprint emitter-receiver tube
  • Solder connections for new emitter-receiver tube with flexible wire
  • Trim bolts on wrist mount (3)
  • Use locknuts on hinge points (2)
  • Insert screws into servo horns into servo (2)
  • Print longer spacers for hinge-side keyboard end 26.5mm long (2)
  • Velcro or magnets for attaching keyboard to holder
  • Add velcro to a battery pack
  • Write instructions 
    • 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
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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2015-10-25 (Su)