When you come up with a method for $12 per finger, let me know
I would love to help you test it.
POD
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On 2006-May 31, at 17:08hrs PM, Randy Boulter wrote:

Forgive me for not providing a more complete description.  The intended
applicaton is a type of "virtual keyboard".  For now, I need to  
simulate,
using a finger-mounted sensor, the action of reaching out and  
touching a key
with one finger.  And then be able to track the finger as it is  
lifted and
moved to another key. This will eventually be expanded to 10  
fingers.   I
located some information on the sensors you mentioned - these could  
be used
to determine if the finger is bent (i.e pressing a key), but that still
leaves the problem of locating the finger in space.  BTW, $6-12 per  
finger
is not a show-stopper - I would just like to do it for less if possible.

Thanks,

Randy


>> I have been tasked with doing a conceptual design for a device
>>  that tracks finger movement using a sensor device mounted to
>> the finger.  Does anyone have experience with this or something
>> similar?  Or thoughts or ideas?  For now, I only have to worry
>> about one finger - but need to track position in 3 dimensions
>> with a resolution of about 5mm over an area of 1 cubic meter.
>>  Also, the device cannot use a reflective method (such as ir or
>> ultrasonic).    So far, I have investigated using accelerometer
>> chips, but these are still fairly expensive and I would like a
>> lower-cost alternative.
>>
>
> I'm not certain this is a feasible project within the parameters  
> given.
> Particularly, the fact that you're feeling accelerometers are too
> costlly gives me pause.  If you can't handle US$6-12 per finger,
> which is the cost of many MEMS accelerometers these days, you
> are not likely to find a non-reflective method for tracking ten  
> fingers
> for less than that.
>
> That said, I believe one of the ways VR gloves do their thing is by
> using strain-sensitive or flex-sensitive resistors to measure the
> degree to which the fingers are bent.  Not sure that's what you need.
>
> Are you trying to track the tip of the finger, then, or the whole  
> finger,
> so that a model of the finger can be reconstructed later?
>
> Mike H.
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