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I need to design a custom data glove for my project. in one end of the glove am using LED light and in another end am using a photo detector and both the LED and the photo diode are placed inside a heat shrink which is stuffed with the transparent wire which conducts the light(similar to Optical fiber cable).the analog signal(current value) from the photodiode is converted into digital signal using a ADC converter and the output digital signal is transferred to the system using parallel port . I tried everything but this concept is not working :( need experts idea to know what am really doing wrong and alternate methods to connect and need circuit diagrams and required coding :( am cutting close to my submission date ! please help me quick :(
Thanks in advance[^]

Please check this link for further info about my project
Am struck in the middle and its going no where and am cutting close to the submission :( would be great if i get some good solution soon

Inbox me @ [DELETED]

[edit]Never post your email address in any forum, unless you really like spam! If anyone replies to you, you will receive an email to let you know - OriginalGriff[/edit]
Posted 21-Mar-12 18:34pm
Updated 21-Mar-12 22:17pm
SAKryukov 22-Mar-12 0:56am
Nothing wrong so far, only... "concept is not working" is not informative. You need to explain a lot more. What was you digital output you feed to the parallel port and what was wrong? How about telling us your platform, language, libraries you used and other relevant detail?
Could be very interesting project, but it would be good to know more detail.

By the way, search CodeProject articles for "Parallel port" -- will find quite a few articles, some are interesting.
Vignesh renganath 22-Mar-12 1:39am
Thanks for the reply ! but in the beginning itself the output from the Photodiode is not enough ! actually we tried the milli and micro amps too but this is not showing any deviation . can u get me a circuit with which the photodiode and LED can be connected to the power supply ! i tried all possible ways but this is not working ! help me soon

Thanks in advance

Please check the updated question ! i have added few more information !
Am counting on u sir !
SAKryukov 22-Mar-12 2:07am
Of course it is not... :-)
Thank you for the update, but counting on me... I'm not strong in schematic... have done robotics projects all on "professional"-grade hardware.
Let me see...
Vignesh renganath 22-Mar-12 2:17am
:) Thank you sir ! looking forward for a positive reply !! Fingers crossed
SAKryukov 22-Mar-12 2:28am
Well, almost nothing is specified. Why USB is mentioned? Well, no matter...

First of all, the principle of operation is completely unclear. So far, I don't even believe it should work. Why the amount of light depends on the curvature of the finger, if it is transmitted through the fiber? Why?

What, the photo sensor signal depends on the light flow? How? What's transmittance function, how is it measured? What's the depth of modulation?

Now, even if it worked, it would measure the average curvature of the finger. It would not be enough to calculate, say, the position of a fingertip, because you still leave a good number of degrees of freedom unmeasured. Did you ever try to count all bones and their degrees of freedom contributing to the coordinates? What accuracy is required? Before drawing boxes with naive "architecture", did you do preliminary research to answer just basic questions? You could just measure analog signals with oscilloscope or something to see the responsiveness of the measurement procedure.

Also, the work looks enormously big, especially if compared to scarce information presented on the demo. It looks optimistic from the first glance, but in fact... I don't know. Here, I asked very basic questions, do you know how to answer. If not, you really don't have anything. I don't say the project is hopeless, but it still need thinking on the basics.

SAKryukov 22-Mar-12 2:29am
Don't hold you breath.... And you don't need "positive" reply, you need a realistic one. Here you go... what will you say?
Vignesh renganath 22-Mar-12 2:38am
we are not using USB anymore :( we moved to parallel port

The concept we propose is " When the fingers are held straight then there will be no deviation in the light signal and the current produced by the photodiode will be maximum ! at the same time when the fingers are folded then there will be a heavy drop in the current that gives me the maximum and the minimum value ! and using the series of such value i can represent the hand movement graphically ! I don't need the exact changes but at least some similar action !
SAKryukov 22-Mar-12 3:25am
Who told you that the "deviation" would reduce amount of light?! Where this "heavy drop" comes from? Did you really measure it? What is the depth of modulation?

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