Hello StackOverflow community,
I've been stuck on the following problem for a bit and would greatly appreciate a bit of help. I apologies in advance for my lack of knowledge about USB in general:
My goal is to use a USB3 port to transmit super-speed data between a computer and another device without having to use the D+/D- USB2 pairs (the reason is that I have 2 optical fibers only!) . In practice imagine an active optical cable which would only be able to transmit the USB 3 super-speed signals -> no D+/D-... both sides of the active cable are of course powered individually. The active cable has on both sides as I/O the copper differential pairs of the super-speed signal as well a source of power.
Both ends of this link are an issue for me at this stage: on computer side is there a way to tweak some kind of USB3 driver to ignore the typical host-device construct which I understand is imposed by the underlying USB2 protocol - a kind of by-pass? On device side... well same thing I guess - I haven't yet figured out implementation option.
Any thoughts are welcome!
Thanks a lot!
Grégory
Currently I am studying about how exactly the bluetooth works and I came across the terms active and passive fingerprinting techniques. Could anybody explain these terms to me or give me some pointers to literature?
I don't know enough about Bluetooth to give a specific answer about fingerprinting it, however, your question seems general, so I'll try giving a general answer.
In general, passive techniques are techniques that don't require active participation in the network. So they can be done without sending packets or frames, just by listening. This means that passive techniques are very hard to detect, but are more limited.
In the case of Bluetooth, passive fingerprinting can probably be done by listening to beacon frames, or perhaps a conversation between two of more devices.
Active fingerprinting, on the other hand, requires you to send frames into the network, to device(s) being fingerprinted, and listening to the response(s).
I am building a temporary controller that needs to monitor 20 separate button pushes along with another 15-20 analog and digital signals.
It also needs to output at least 20 different digital signals.
Which Netdurino will let me get all these different ports together on a single device?
It seems like the Netduino Go with multiple shield bases (image) is the way to go.
Can anyone confirm that this is the hardware solution I am looking for with the most analog and digital ports available?
Thank you,
Keith
Seeing as you're settled on the Netduino platform, I'd suggest you ask either on the Netduino forums or in their live chat room http://forums.netduino.com/index.php?/chat/
Alternately, https://electronics.stackexchange.com/ might yield better answers than stackoverflow.
Note that in the forum post you link to for the shield base, they indicate that only one shield base is supported per Netduino (at the time of writing, this may have changed):
Another noob question: How many shield bases can one connect to a NGO? Is more than 1 a viable option?
Currently just one. But with the final release I'm hoping on more :)
I am new to NS-3 and I have a UDP WiFi simulation that works fine. I need to expand my simulation by enabling Distributed Coordination Function with Collision Avoidance. Can someone please explain to me exactly how I modify my code to achieve this?
Thanks.
UDP over IP over wifi is already using the MAC-level CSMA-CA DCF. In short, your simulation is already simulating what you want.
I'd like to have an application monitor written in C# monitoring a set of Forex trading positions. It would be connected via USB to a real set of "traffic lights" sat on a desk which it would use to indicate system status. Can anybody suggest a good solution?
Normally I'd say parallel port or some other such thing, but if you've got your hopes up for USB, then definitely have a look at the Arduino. It's a very low cost microcontroller that can run standalone, or can talk to a PC through a number of flexible interfaces (including USB).
It is extremely popular with the hobbyist community, and as such, there are a number of entry-level projects to get one started with the device. Price on Sparkfun is $35 USD for a fully assembled USB-enabled version.
I have used the concepts in this CodeProject article to successfully light up LEDs.
It might meet your requirements if:
You can use parallel port instead of usb (or maybe usb to parallal cable/dongle)
You are ready to tackle some soldering and simple electronic tinkering
You can modify the vb code to monitor your status
As the author mentions in the article, you can destroy your computer's parallel port (and worse!) if you are not very careful.
In addition, a good engineer would insist that you isolate the lights from the port to further protect the computer. (relays, triacs, opto isolators, etc.)
That being said, it does work!
The easiest solution is to buy a USB traffic light, rather than building one yourself. E.g. USB Ampel. With a simple API included, it would probably be much easier.
Traditionally people have used the X10 automation framework for this kind of thing. People at my company use it to control lava lamps to indicate the status of our continuous integration build.
There's a pointer over at How does one get started writing applications that interact with x10 protocol?
One step further is to build something yourself using a microcontroller platform like the Arduino. Some examples of what is possible with the Arduino platform are available on the Arduino Playground page.
An article on how to make traffic lights using an Arduino is available at Instructables.
Channel9 has a video from the Microsoft PDC showing how some developers use a "Build Bunny" for something similar: PDC2008 ShowOff Entry: Brian the Build Bunny
There's also more information and source code here.
Try using simple usb experimentation interfaces such as Phidgets (Www.phidgets.com) or the Velleman k8055 USB experimentation board (http://www.velleman.be/ot/en/product/view/?id=351346).
We used this product at my last job to control a set of revolving traffic lights when a build would break on our CI server. The Ethernet is nice so that you are not limited to the 3M range of USB and it is as easy as opening a TCPClient to port 10000 and sending a "1R1\r".
http://www.6bit.com/products/smartrelayE.php?products_id=33