# Require help for project on analog designing

F

#### [email protected]

Jan 1, 1970
0
If i want to create 3D mouse working with movement of hand using capacitance developed due to movement of hand, is this idea coming under my project domain i.e. analog designing ?

R

#### RobertMacy

Jan 1, 1970
0
If i want to create 3D mouse working with movement of hand using
capacitance developed due to movement of hand, is this idea coming
under my project domain i.e. analog designing ?

There used to be two companies, may still exist, that made 3D mouses based
upon magnetic fields. One made a glove for 3D computer inputs for 'virtual
reality'.

Sorry can't remember their names, one was east USA, began with the letter
'P', which generated 10kHz like frequencies from fixed positions and the
strength of the signal to the receiver determined distances, the other was
in California and the Ch Bd had a french name, gone brain dead with all
this time. But, this was all circa 70's

'Problem' with using magnetic field for sensing position was the delay.
The delay made the user feel like swimming in water, or like the delay of
the stream of water from a garden hose - you moved, later the object
moved. That was the biggest complaint from users. The other one was the
distortion to the field caused by surrounding metallic objects.

For what it's worth, the technology capabilities have really shifted and I
recently made a displacement measuring system using magnetic field
principles, cost? processing was free [piggy backed on the uProc already
there] plus $1 per sensor pair for components [in 100 quantities], plus 5mA per pair of sensors. So for almost NO cost and NO power what did you get? You could measure from 6 inches to 27 inches. At 8 inch displacement the measured noise was 1 mil rms. Yes, one thousandth of an inch rms noise AT 8 inch displacement for$1. I told you technology has come up around
our ears.

There is a company in England that makes a capacitive sensor that has
better than 100ppm accuracy. But that requires some control to the design.
From memory required triax cabling to make it work.

Queensgate Instruments Ltd provide NanoPositioning and sensing solutions
for OEM
development and automation applications.
http://www.nanopositioning.com

If you have a way to make a 3D mouse WITH tactile feedback that does NOT
require anything but the cellphone; Samsung wants to talk to you.

Hope all this helps.

U

#### [email protected]

Jan 1, 1970
0
If i want to create 3D mouse working with movement of hand using capacitance developed due to movement of hand, is this idea coming under my project domain i.e. analog designing ?

So you are trying to reinvent the Theremin instrument
http://en.wikipedia.org/wiki/Theremin

Two or three independent oscillators might be usable to detect the
position of the finger in 2/3D space.

D

Jan 1, 1970
0
capacitance developed due to movement of hand, is this idea
coming under my project domain i.e. analog designing ?

So you are trying to reinvent the Theremin instrument
http://en.wikipedia.org/wiki/Theremin

Two or three independent oscillators might be usable to detect the
position of the finger in 2/3D space.

Just install G-Force Platinum, and select the audio input source you
want to look at.

This the modern day 1960s color organ, mind you.

Taken to the Nth degree.

Well worth it too, as it allows you to pass your images behind the
image array layer and other things. The ultimate photo album.

<http://www.soundspectrum.com/g-force/index.html?src=home>

J

#### Jasen Betts

Jan 1, 1970
0
If i want to create 3D mouse working with movement of hand using capacitance developed due to movement of hand, is this idea coming under my project domain i.e. analog designing ?

so it's like a three-axis theremin?
possibly easier to do in the petahertz range :^)

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