Electro-Optical Detection is HERE!! Friday, 5 February, 2010
Posted by Taha in My Progress.add a comment
Well first of all Happy New Year to all, its been a long time since posting anything. Okay so just over a year ago i started thinking about electro-optical sensing as a form of input detection for Multi-Touch and surface computing applications http://mtaha.wordpress.com/2008/12/25/update/. As such i’ve been working on this primarily by myself and am glad to say that within the next few months will have something to showcase. Till then here is are some titillating items below the break
NUI Group Community Book – Multi-Touch Technologies Friday, 5 June, 2009
Posted by Taha in My Progress.add a comment
The first edition release of the NUI Group community book Multi-Touch Technologies, is here!
This book comprises state of the art articles from the NUI Group Community Wiki, as well as several chapters written by leading experts in the field specifically for this publication. Detailing basic hardware technologies as well as the process of developing software suited for multi-touch systems, this book provides a technical introduction to the world of multi-touch.
I am proud to have been a contributor to and co-author of this book. Please check it out as it is full of helpful information. Well done to all who took part and made this possible..
Click here to download a copy of the book..
For more info please see the original post here at NUIGroup.
UPDATE:
We have gone ahead with the printing process, through Lulu.com’s online printing services. A this point, we are still waiting for an ISBN number to allow distribution through Amazon.com and other retail channels to achieve maximum readership. Once the ISBN application process is completed, ordering information will be made available. Tentatively, the price for a copy of Multi-Touch Technologies is $7.00 USD, + shipping. We are working to lower this cost: it is not final.
And remember, the online pdf is 100% free! – the version that is going to the presses is available on the NUI code downloads, as described above
Thanks!
Community Earth Sunday, 31 May, 2009
Posted by Taha in My Progress.add a comment
Well after a long period of development and testing I together with icube and nuigroup are rolling out RC1 of Community Earth for the community to start getting involved in development and give feedback on the project.
Bi-Directional LED Sensing Tips Friday, 22 May, 2009
Posted by Taha in Hardware.8 comments
Okay since my last post i’ve been doing a bit of reading and doing some tests on bi-directional led sensing. These are a some Tips i present to people who are interested in taking this further. I personally have given up perusing this route of sensing mainly due to its limitations of use, and sensing capabilities.
Helpful Hints
Helpful Hint #1: Using Inexpensive LEDs as Optical Sensors
Most LEDs can be used as detectors without harming the device in any manner, there are some leds which dont work as well, the ideal typle of led is a red led and with a clear casing.
The trick to get an led to sense is to electrically bias the LED in the proper current-voltage (I-V) quadrant for operation as a detector and to detect an appropriate range of wavelengths.
The LED, as the name (Light Emitting Diode) implies, is electrically a diode and can be used as a detection device similar to a photodiode.
LED Sensing Sunday, 3 May, 2009
Posted by Taha in My Progress.1 comment so far
Alrite to update from my previous post heres an update video of my 3×2 matrix using led sensing
LED Sensing ~ Bi-Directional LEDs – Part 2 Sunday, 3 May, 2009
Posted by Taha in Hardware, My Progress.add a comment
So to continue on with my last post … Now that we have this photo current what can we do with it, how can we make use of it, to detect inputs. The nature the LED is such that the photo current is very small, due to the geometry of the PN junction, which is not designed to maximise to act as a photo diode. However using a small trick we can integrate all photo currents over a set period of time, and make the diode act as a capacitor. We this by charging up the diode and then seeing how long it takes the photo current to discharge and go to a logic zero.
LED Sensing ~ BI-Directional LEDs Part – I Sunday, 3 May, 2009
Posted by Taha in Hardware, My Progress.Tags: bi-directional, concept, electronic, electrooptical, han, Hardware, IR, jeff, led, Leds, multi, Multi-touch, multitouch, natural user interface, nui, sensing, touch, Webcam
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In my quest to find other methods of input detection for multi-touch and multi-modal hardware i came across another technique made famous by Jeff Han it is the use of LED s as bi-directional sensors. This technique is in no means new, it know fact that LED s can behave in such a way that, they act as sensors, when they are reverse biased. The theory behind how this all works is explained below.
