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.6 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 capablities.
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.
Update April 30th, 09 Thursday, 30 April, 2009
Posted by Taha in My Progress.add a comment
Well sorry for the delay in releasing the source of my media viewer application, i got busy with exams and what not… Anyway i promise the source of MediaViewerApp 0.4b should be up by the end of the week.
As for some news I’ve been working on some interesting approaches for multitouch and multimodel input devices…. Currently my work has shifted away some what, from the whole software side of things and moved back into my preferential domain; working with hardware.
I’ve never been a huge fan of either capacitive or optical systems used for input detection… each has there own flaws, which I’m not going to go much into depth describing, apart from just saying they are far from perfect. The major drawback of capacitive systems’, is that they rely on the human touch factor; where the system seizes function if the users skin does not come into contact with the capacitive input device(i.e. if you are wearing gloves the system seizes to work). Although Optical Systems by far are one of the best methods of detecting input they still rely on field of view (FOV) and as such aren’t as mobile in large form factors, since the depth of the system is proportionally related to size of the screen depending on the focus of the lens being utilized by optical sensor.
As such i’ve moved away from both these methods and have started to look into other electronic methods of input detection.
