check the transfer rate of the device(actual throughput rate). Decide on
what level of resolution and compression your intending to use, this will
give you a size per frame, multiply this by the number of frames per second
you want to transmit, if you want real time video you will need 25fps for
PAL or 30 for NTSC, this will give you your required data rate. If the first
figure is less the second, go back to drawing board. if the first figure is
larger than the second, then decide on how you are going to implement your
compression algorithm (software or FPGA etc), you should about now have a
serial stream which you need to convert to TCP/IP packets (XPORT? I dont
know its throughput) then you will need an 802.11 type bridge for your
ethernet packets to be sent over the WLAN. at the other end you either need
an access point or bridge to get your ethernet packets back, next you will
need either a decompression engine and a composite video out or some
software to receive and decode the packets, ready for display.

I think that should be a basic rundown of what you need to do(excluding a
step here or there, nothing substantial...I think), but dont quote me as I
havent done one myself before.....and I'm tired n hungry :-)


Cheers


JJ

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Liam O'Hagan
Sent: Tuesday, 13 January 2004 12:08 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [ot]: wifi cameras


You could perhaps implement such a device using something similar to the
Lantronix Xport that I'm in the process of buying...

www.lantronix.com

> -----Original Message-----
> From: Herbert Graf [SMTP:mailinglist2@FARCITE.NET]
> Sent: Tuesday, January 13, 2004 11:23 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [ot]:  wifi cameras
>
> > Can anyone explain or provide a link to an explanation
> > how this works?
> >
> > I know the various wifi devices become items on the
> > wireless network.
>
>         The devices I've seen basically have a web server embedded, to the
> network
> the camera looks like any other Ethernet device, with a web server.
>
> > Is a device like this 'home brewable'?
>
>         Most definitely, easiest way is with an old computer an Linux. To
> keep it
> similar in size to those on the market isn't trivial though.
>
> > The camera, for instance, comes with an application that
> > evidently communicates with the camera and displays the
> > picture in a little window.
>
>         Usually you open the connection with a web browser, the camera's
> server
> uploads a Java applet that results in you seeing the video. Neat devices,
> far to expensive at the moment for me, but prices will drop. TTYL
>
> ----------------------------------
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> http://repatch.dyndns.org:8383/pic_stuff/
>
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