Subject:
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Re: BT in robotics
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 3 Jun 2005 15:03:32 GMT
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Original-From:
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Bruce Hopkins <JAVASPACES@GMAIL.COMstopspam>
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Reply-To:
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bhopkins@apress.com{StopSpam}
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Viewed:
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1122 times
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Bruce,
1. Yeah, SonyEricsson is very serious about their Linux robot
2. How else (other than Bluetooth) could you send data from your
cellphone to your robot? IR isn't an ideal solution, since a lot of
phones don't support it.
3. I created the JB-22 kit, so yes I use it. I use it alot. It's a
very cheap kit that allows anybody to get started with Bluetooth
development.
4. When I get a chance, I'll try to do some real tests for you
regarding pure data tx times. The 2-3 second time frame that I gave
you is the time it takes for my java class to startup, get the cached
connection parameters, create the connection, create a session (which
is optional), read a file from the hard drive, send the data, close
the connection and session, and return. In 2-3 seconds, in my opinion,
that's pretty impressive. And of course, I used the JB-22 kit for all
this.
5. Bluetooth does has a 7-node limit for piconets. However, you can
overcome this limitation by chaining your piconets together, which is
called a scatternet.
6. Bluetooth has lot's advantages (trust me, I can go on and on) for
instance, you can run TCP/IP over the Bluetooth protocol. Let that
sink in for a second. That means that you can have all your wireless
Bluetooth devices communicate to each other with an IP address, and
you'll have the full TCP/IP stack to play with. Your networked
application doesn't even have to know that all the nodes are wireless
and doesn't have to care about communicating to the nodes using the
Bluetooth semantics.
I'm also a Java fanatic, and Psinaptic makes a Jini implementation for
the CSR BlueCore2 Bluetooth chips. That means that you can have your
Bluetooth devices form a Bluetooth network, and then overlay it with a
Jini network. Very, very cool.
http://www.psinaptic.com/blue_core.jsp
7. Yes, we definitely need to collaborate, because I can see some
really cool applications coming on the Bluetooth side of things.
Regards,
Bruce H
Author, Bluetooth for Java
http://www.javabluetooth.com
On 6/3/05, Bruce Boyes <bboyes@systronix.com> wrote:
> At 10:46 PM 6/2/2005, Bruce Hopkins wrote:
> > Bruce,
> >
> > 1. True, Bluetooth is embedded in a lot of cellphones. But cellphones
> > is not the only device that carries Bluetooth, as you already know.
> > However, SonyEricsson has created the ROB1, which is a Linux robot
> > that is controlled by Bluetooth, rolls around, and takes pictures.
> > Take a look here:
> > http://www.sonyericsson.com/rob1
>
> They are obviously pretty serious about this product
>
> > 2. Well, if Lego or JCX, was Bluetooth enabled, then it would be of
> > some help to this group. I would love to carry in my pocket a remote
> > contol (ie. a cell phone or PDA) for my lego robot. Almost every
> > cellphone and PDA on the market has 4-way or 5-way navigation, so
> > that's great for a robot remote control.
>
> I'd love to have my cell phone give me status and feedback from my robots.
>
> BT isn't the only way to do this, of course, and using the cellular data
> capability of the phone would allow connecting from around the world, not
> just within 10 meters.
>
> > 3. The JB-22 is a Bluetooth development kit that allows Java
> > developers to write Bluetooth applications between two PCs. The
> > examples in the kit allow you to quickly get up to speed with device
> > discovery, service searching, and two-way communication. However, this
> > kit also allows you to communicate with other Bluetooth devices (that
> > are not Java-enabled). You can also use the libraries in the kit to
> > write Java Bluetooth applications for JSR-82 cellphones.
>
> Have you used this?
>
> If so, what was your impression in an actual project?
>
> > 4. This is no performance metric, but I've made cached connections
> > from two Bluetooth enabled laptops (where I sent a file from the
> > client to the server) in about 2-3 seconds.
>
> The kind of embedded systems on which we are working need to authenticate
> and exchange a few bytes of data in low tens of msec, max. Zigbee claims to
> be able to do this. We will have some personal experience in a few weeks.
> We've been using 900 MHz RF modems from other vendors thus far.
>
> > 6. If your cellphone or PDA supports J2ME, then it's end-user programmable.
>
> I had high hopes for my T720, which does have J2ME. However TMobile chose
> to not support the serial port, so deploying and debugging apps is much
> more of a pain than it needs to be. It's way too klunky trying to enter a
> URL on the phone keypad.
>
> So I gave up this idea and bought some Tungsten C (with 802.11b) instead.
> They also support Java, and other Tungstens have BT built in, or you can
> add a BT SD Card.
>
> > Now, here's the potential for Lego and Bluetooth: I can create one (or
> > many) custom Bluetooth services for my lego robot. My Bluetooth
> > cellphone or PDA can discover, search for the services, and send data
> > to the Lego robot. Since alot of other devces support Bluetooth, I can
> > do things like:
> >
> > a. provide internet access to my robot (probably not on a CDMA network)
> > b. send cool stuff from my phone (like text or pictures) to my robot
> > c. grab Bluetooth GPS data and relay it to my robot
> > d. the list goes on and on
>
> This sounds great. You still have the 7-node BT limit right?
>
> My personal bias is that Zigbee is better for the robot net communications.
> 802.11 or BT would be better for communication with a PDA or phone.
>
> We're pursuing the Zigbee approach.
>
> But we'd love to collaborate with someone (you?) on a robot swarm with BT
> support, maybe through a PC bridge which has BT and Zigbee support?
>
> Our current thinking is Zigbee on the swarm, with a local Java node (JStik
> for example) or notebook with Zigbee and 802.11 wired. Running JXTA on the
> robots and the notebook gives you a nice link from the robots to the
> internet. That's the grandiose plan, anyway.
>
> Regards
>
> Bruce
>
>
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Message is in Reply To:
 | | BT in robotics
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| (...) I'd love to have my cell phone give me status and feedback from my robots. BT isn't the only way to do this, of course, and using the cellular data capability of the phone would allow connecting from around the world, not just within 10 (...) (19 years ago, 3-Jun-05, to lugnet.robotics)
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