2015-08-08 (Sa) Wrist Mounted Chording Keyboard

Code was started which would completely replace the Spiffchorder code supplied online. The purpose in a new program was to have a deep understanding of how the code works so that changes can be made most efficiently in the future. Hardware controllers, probably Arduino Pro Minis, may be used for other tasks in future keyboard projects. Flexibility in future hardware could allow for the addition of advanced features like servo movement to deploy the hinged key levers or a virtual mouse which would react to wrist angle rather than a desk surface.

The code aims to capture any button presses then when all keys have been released it will compute keyboard output based on the keys. All chords will be based solely on the alphanumeric tables supplied in the Spiffchorder documentation. For this reason any person familiar with typing on a Spiffchorder will have the ability to type on this project without relearning the rudimentary chords. The chords already used are logical and well documented.

An online Arduino programming environment, Code Bender, was explored which allows for many Arduino IDE functions. It seems to be a robust system which doesn't require the bulky Arduino IDE but only a small plug-in and some drivers. The site is free but asks for donations. It also allowed the code to be embedded in a web page which is shown below. In the past a link was supplied on the web page which always contained the most recent version but in order to show the coding process daily saves of the code will be provided and the final version will be available when it is finished.


Code written on 2015-08-06


A table was made from the established chords which rearranged the letters according to their key input. In this way key press chords can be represented as binary and their decimal value equivalents can be used in a large switchCase() algorithm.

CIMPR

11
w
210
y
311
u
4100
r
6110
h
7111
s
81000
i
91001
b
101010
k
111011
z
121100
d
131101
[
141110
e
151111
t
1610000
space
1710001
f
1810010
g
1910011
v
2010100
c
2110101
]
2210110
p
2310111
n
2411000
l
2511001
x
2611010
j
2711011
q
2811100
m
3011110
a
3111111
o


To do:
  • Secure Ethernet wire with a cable clamp
  • Figure a way to mount to wrist
  • Figure a way to move hinge pieces
  • Make model and OpenSCAD code public
  • Write keyboard code

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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2015-08-06 (Th)

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