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RFID tracking and positioning project

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Nameless_87 View Drop Down
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Post Options Post Options   Quote Nameless_87 Quote  Post ReplyReply Direct Link To This Post Topic: RFID tracking and positioning project
    Posted: 22 March 2010 at 11:59am
Just wanted to ask... isn't there a way to buy the hardware ready instead of having to build it myself? Or can I use another type of hardware (buy it ready) and apply the software on that page on it?

Also, from where can I buy those specific parts if there is no other option than to build it myself. (I mean, ebay, amazon, etc)?

Thanks
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amal View Drop Down
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Post Options Post Options   Quote amal Quote  Post ReplyReply Direct Link To This Post Posted: 22 March 2010 at 7:12pm
Originally posted by Nameless_87

Just wanted to ask... isn't there a way to buy the hardware ready instead of having to build it myself?


You can buy the a ready-made tracking system (hardware & software) through purelink.ca (the first link: http://www.purelink.ca/Product/Observer.aspx).

At this point I'd say you just have to figure out if you have the money to spend on buying a ready-made system or if you have to go the cheaper route and follow the instructions and build it yourself.
Amal ;)
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Post Options Post Options   Quote Nameless_87 Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2010 at 12:05pm
Thanks,

I'm looking into the second one as said before... and will probably build the hardware...

Now for the software part...

Instead of making a website using php, javascript and such, I want to do it as a .NEt application (C#).

The most difficult part seems to be the signal strength thing... which is done in python if I'm not mistaken and I never done python before... Do you think there is another way to implement the solution with another language instead of python? Or is it not that difficult to learn?

Thanks for every reply, you really helped me :)
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Post Options Post Options   Quote amal Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2010 at 12:21pm
It should be no problem to deal with RSSI if you don't actually want to triangulate position and instead simply perform a "closest point" analysis like the guy who built his own did. All he did was place an "reader" in each room and simply compare all the RSSI signals to figure out which reader the tag was closest to and place the tag/person in that room. When they moved out of the room and into the hallway, the animation shows the person moving into the hall. There's no way for the system to figure out WHERE in the room the tag/person is, but that was not necessary for his application. Something tells me it won't be in yours either.
 
The availability of cheap hardware means you can afford to place readers/receivers in every room, and for the most part, the goal is simply to know what room someone is in... so there's your solution. Simple!
Amal ;)
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Post Options Post Options   Quote Nameless_87 Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2010 at 12:27pm
Thanks again,

Yes, for my thesis I don't need triangulation, I just need to see in which rooms are the doctors, but I don't need the specific location so signal strength is enough.

However, I just read that the guy who build his own (2nd link as usual) had to program the rfid and he had to buy the portal software to upload the code onto the tag and readers, etc.

My question is, if the link provided above (cheap hardware), the tags and readers are already programmed?

What I want basically is to read the signal strength using C# for example, so I don't know if the above hardware is suitable for this.
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Post Options Post Options   Quote amal Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2010 at 12:33pm
Yep, the tags are preprogrammed and the readers spit out tag IDs with RSSI data. Very simple. Read the blog post... it covers how the tags and readers work. All you will need to do is set up two or three readers, connect them to COM ports on the computer or use USB COM adapters, and there you go. As long as you can open COM ports and read data in C#, you should be good to go.
Amal ;)
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Post Options Post Options   Quote Nameless_87 Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2010 at 12:39pm
That's great thanks,

The only disadvantage I see is that the link I was going to use, used a mesh network therefore the readers only needed to be given a 3V power... and only 1 reader needed to be connected to the pc via a serial port.

This seems to need all readers connected to a pc... which I don't think I can do since in a hospital in patient rooms and such there wont be a computer :/

Is there a way around this?
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Post Options Post Options   Quote amal Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2010 at 1:05pm

I'm sure there is a way around it, but you'll have to figure that one out yourself :) I'm simply suggesting an option for constructing a working demo, not a fleshed out product. In a real-world scenario, readers would be connected over their own communications network (whatever that may look like, i.e. wired, mesh, etc.) and communicate with a central control PC.

For your demo, a simple setup using some cheap tags with a few cheap readers all directly connected to a control PC over RS232 serial should be sufficient to demo a workable proof-of-concept system. If you want something fancier, you need to spend the money and go buy a commercial solution, or buff up your hardware/software skillz and make it.
Amal ;)
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