Is there a way to send and receive messages over the comm ports on a computer using java? I have an arduino listening on a usb port for messages. I would like to talk to it via a java gui instead of the arduino processing gui. What are some ways i can achieve this? C# works too!
I wrote app for arduino in java using RXTX lib. You can read many tutorial both on RXTX home site and other. For example:
http://arduino.cc/playground/Interfacing/Java
http://rxtx.qbang.org/wiki/index.php/Examples
jUSB might be what you are looking for.
"JavaComm" works pretty well as long as you're on a supported platform (such as Solaris). Do you have operating system requirements?
I was just reading through this site and thought this little gotcha might bite you as you start experimenting. Basically whats happening is that the arduino resets automatically every time serial communications are initiated. This site describes the problem in detail and gives several workarounds depending on your skill and/or comfort level. Have fun hacking.
#GETah
I pretty sure that ardruino just uses serial through the usb port. It still creates a COM port through the usb connection to the ardruino.
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Is it possible to monitor WiFi traffic and send data myself? My goal is to learn how to monitor probe requests, send deauth packets, and other operations similar to AirCrack and the other libraries found on the BackTrack os flavor.
You might have a tough time doing what you want to do in a Windows environment. If you poke around the Aircrack site a bit you'll see that the Windows version is pretty useless in comparison to its Linux counterpart, in large part due to the open source driver availability in Linux and the lack thereof in Windows. You can definitely packet sniff etc. ( http://www.codeproject.com/Articles/12458/SharpPcap-A-Packet-Capture-Framework-for-NET ) but you won't get the robustness that you can get out of a similar application in Linux.
I don't know about sending just random radio signals, but you can certainly monitor the traffic and data. Here is an article which describes how to do it.
AirPcap from Riverbed. USB adapter that can run in monitor mode and has an API for channel switching and more, and you can send Wi-Fi frames if you buy the right adapter. Wireshark has builtin support too. The Alfa cards are a good choice, but only for 'nix
I have used the LPT port before with a VB6 library called inpout32.dll. I'm much more familiar with that but it is not used in modern computers, such as laptops.
I need to control a device with on / off capabilities. This would have been very easy with LPT, but I need to work with USB and C# in this case. There are some USB2LPT cables out there on the market, but I read that they can't be programmed the same way.
Has anyone used those cables before? If yes, how can I work with them. Otherwise what are my alternatives?
I need information how to link two voice modems to each other.
From modem 1 I dial and play a .wav file
then I dial modem 2 and link them to allow them speak.
What do I need to link two modems in C#, is it technically possible?
Thanks.
it is possible, but it will require a fair bit of work.
You need to send commands to the modem to lift, make the call etc. You can do this through AT commands, and the System.IO.Ports.SerialPort class. This bit is fairly standard, and i'm sure you can find an example/lib out there that will handle all this at a higher level than AT commands.
To link the voice part of the modems will depend on the exact modem. Most modems will install an audio component for the OS. If yours do, then what you need to do, is use directX to read/write to the specific audio devices.
What you're building here is a simple voice switch of sorts, and they do require a bit of work. Good luck.
I am working on a personal project involving sending simple signals from my computer to a circuit via USB. Basically I am using the USB signal as the gate signal for a MOSFET which will in turn activate a relay to turn on/off various AC peripherals. For example if I want to turn on a light bulb for 5 seconds every minute I would be sending a 1 down the first wire for the first 5 seconds of every minute.
This is my problem: I have no idea how to manually send a 0/1 down a specific wire on a USB cable, or even interact with a USB port at all :(
So I guess there are multiple parts to this question, is it possible to interact directly with the bits being sent via a USB port? If so how would I do this? I am familiar with C++ and C#, so I really hope that you can do it in one of those...
Thanks!
edit Hmm so it looks like the USB port actually only has one 5V pin so direct USB interaction wont work. Going to take a look at a parallel adapter and get back on it.
USB is a bad fit for anything that doesn't have a USB interface at the other end of the wire. If you don't want to get into building your own USB device, I'd suggest buying a USB to serial adapter, which gives you two directly-controllable output lines (the flow control lines), or a USB to parallel adapter, which gives you more than 8 lines.
Chris Johnson's answer has a link to instructions for Windows serial port programming. You'll want to look at section 7 -- the SETDTR, CLRDTR, SETRTS, and CLRRTS are your flow control line toggles (for the DTR and RTS lines, respectively).
As far as hardware goes, a "1" (SET) value on a flow control line is +3 to +15 volts on the line, and a "0" is -3 to -15. Actual voltages can vary between devices; measure it to be sure. (EDITED; I got the 1 and 0 mixed up. The control lines use the opposite convention from the data lines.)
Here are Wikipedia pages for voltage characteristics and pinouts.
EDIT: Having done some more research on USB-to-parallel adapters, I don't think they will give the needed level of control. For best results, you'll need a PCI or PCMCIA parallel card, or a parallel port built into the motherboard.
I'm not a Windows programmer, but this library might be useful for controlling the parallel port's lines from Windows.
The easiest thing to do for this application is to use serial port emulation, either with a USB-Serial cable, or with a USB-Serial converter chip (e.g. the FTDI FT232) in your hardware device.
Either way, this allows you to interact with your USB device as you would a serial port (see, e.g. here for how to do this in C++ in Windows)
Much like Chris suggested, you can get a USB slave device from FTDI. $27 at digikey will get you a small board with all the fine wiring already done.
However, for your purposes the bit-banging mode described on page 39 of the datasheet would be much better than the UART mode (UARTs generate pulses at several kilohertz, you want to have the voltage stay at the level you set it to).
Hopefully your MOSFET will turn on with a 3V signal since the FTDI will put out approximately 3.1-3.2V for a high output.
Also, make sure you use the latest drivers from FTDI... a couple years ago they had drivers (WHQL-certified even) that caused frequent BSOD, and I've often found that driver CDs that come with hardware are several years out of date.
I built something very similar to what you are doing (I was running a car window motor from a usb device, used a mossfet H bridge (the HDR1X8 on the diagram) to drive the motor.). You need a USB to I/O device this is what I used (I got a U421, they fit perfectly over the center line of a breadboard, the 401 works well with breadboards too if you don't have a split one.
They give you a dll and you just link in to it with your code. its just as simple as making a call to WriteA and WriteB for writing out to your mosfet device. Be warned logic level lines are not meant to drive current so you will need to hook this up to a transistor if you expect any kind of medium to large current flow. See App1 in the application notes of the menu on the usbmicro site to see the proper way to hook it up.
Use a USB prototype board. It usually comes with a software SDK.
Check out these links from my web site:
1.You can use a usb to serial converter. All you need to know is here
2.You can use programming to access the usb directly but for this one you have to have a driver already installed for you device. Details are here
I'd like to use the Wiimote (accelerometers, gyroscopes, infrared camera, etc, etc, etc) on various applications.
It's a bluetooth device, and I know others have connected it to their computer.
What's the easiest way to start using it in my software - are there libraries for C#, for instance?
I want my software to be usable and easily installable - what's the current easiest way to connect a wiimote to the computer? Can I make that process part of my software installation?
-Adam
Have you seen Johnny Chung Lee's 'Procrastineering' Blog? He's written a lot on the subject of using wii remotes and has some fantastic demonstration videos. [Edit] I just found out Mr Lee did a TED talk which gives a good introduction to the stuff he's done too...
There's a wealth of information over on Wiibrew.org - check out their Wiimote Library page for some other APIs if you want to look beyond c#. As an avid Python fan, I'm quite curious to have a play with the pyWiimote library :-)
Coding4Fun had a managed C# library up that would allow you to interface with it but it seems their site is down right now. Though I think they used the Robotics Studio so that may be a place to start.
Found it... http://www.codeplex.com/WiimoteLib
Oh and I forgot to post a link to these videos I saw quite some time ago. http://www.cs.cmu.edu/~johnny/projects/wii/
If you use WiimoteLib (from Coding4Fun as mentioned in another answer), there is an example application called WiimoteTest. This tests all of the Wiimote inputs and outputs, including for multiple Wiimotes at the same time, so it is a good starting point for your own Wiimote code as it gives you an example of how to do pretty much anything you would want to.
For the second part of your question, connecting the Wiimote to the computer is pretty much the same as connecting any other Bluetooth device. I don't know that it would be very suitable to have this done at installation as it is likely to be connected and disconnected a lot, especially since the Wiimote will turn itself off if not used for a while. However, it's pretty much a matter of following a standard Windows wizard to connect to it, so it's not too hard. This assumes you have a Bluetooth driver that will work with the Wiimote - more information on that is available at the Coding4Fun website. It worked for me with the default driver that already came with my laptop but if it doesn't for you, the one they recommend is BlueSoleil.
what's the current easiest way to
connect a wiimote to the computer?
I not found solution for connect wiimote within my software, you have to connect manually into Windows, but on Windows register bluetooth device it very take time, Try Toshiba bluetooth stack it more convenient.