We get excellent results using Dasher with the SMARTNAV headmouse
from NaturalPoint and with the
from Origin instruments. Both these devices track a reflective dot on your head (or whatever bit of you
you want to waggle). Both require a USB port. Here's a comparison, with green entries showing the
||SmartNav ||Headmouse Extreme (manual) |
Price (Nov 2005)||$300 ||$1000 |
Requires software?||Yes, works on Windows only ||No, works on any machine with USB, including linux and mac |
Works in sunlight or with bright lights in background?||Not great ||Yes, very robust |
Adjustable?||Superb software allowing adjustment of gain in both direction, smoothing, etc ||Not very; because it has no software, it's not as adjustable as the smartnav; but it does come with a binary switch that you can toggle to increase the gain x2. |
Advice on using the trackIR headmouse (now known as the smartnav)
This is a tip for wheelchair users regarding the headmouse, it may help the
able body users as well.
I use a track IR headmouse 8-12 hours per day with no problems. What you are
probably lacking is a good headrest. Being that without a headrest I
couldn't hold my head upright for 10 minutes, it's not a matter of strength but
stability. Having stability allows the scaling or speed of the cursor to be set
very high. You should also turn the smoothing all the way up. This way very
little head movement equals full screen coverage. Try relaxing and rolling your
head side to side and tilting up and down, if you are moving more than 1 inch
to Cover the screen you're working too hard.
By leaning against a headrest neck strain is greatly reduced. Try a high
back chair if possible and see if it helps.
Ronnie Love (PALS)
The following images illustrate the unicorn extension
that I use with my trackIR headmouse. (Now known as smartnav;
don't buy a trackIR any more, this brand name is being used for a different
headtracker that is not flexible enough for Dasher use)
The reflective dot is attached to my safety glasses by a three-inch piece of flexible
This arrangement increases the gain of my head motions by about a factor of two,
thus reducing the motions I need to make to use Dasher.
To get the same effect without looking so stupid, you could
use a baseball cap and put the reflector on the brim.
NaturalPoint sell a cool TrackHat.
The Dasher project is supported by the Gatsby Foundation
and by the European Commission in the context of
the AEGIS project
- open Accessibility Everywhere: Groundwork, Infrastructure, Standards)
Site last modified Sat Mar 19 12:11:40 UTC 2016