AVR-Chat

On Mar 12, 2006, at 7:03 AM, Thomas Keller wrote:

> Greets.
>
>    I have a headache.  I have a body-wearable electronics package,
> battery operated, which is generation on the order of 5 mbits/ 
> second of
> data which needs to be RF linked to a PC within 100-200 feet.  While
> there is no real reason the link itself needs to be an 802.11 link,
> utlimately, the data stream reaching the computer needs to be in  
> TCP/IP
> UDP packets.  (I can handle generating the UDP packets at the recevier
> end of the RF link, if need be).
>
>   My problem is getting the data from the body-wearable package TO a
> receiver. I have been looking at various solutions.  My personal
> favorite would have been Zigbee (IEEE 802.15.4) but the data bandwidth
> is simp;ly not there.  So, not finding anything else with sufficient
> bandwisfth and range, I find myself pretty much forced to lpook at  
> 802.11.
>
>    PROBLEM: how do I talk to an 802.11a/b/g WLAN adapter from an AVR?
> Should I choose a USB enabled AVR, and use a USB WLAN NIC?  Or  
> should I
> try to use a PCMCIA or CF card WLAN adapter?   From what little I've
> been ab;e to find out, getting the necessary technival information to
> successfully communicate with and control PCMCIA and CF card  
> adapters is
> difficult, at best.  (I also worry about the physivcal/electrical
> aspects of the interface).  I have plenty of bandwidth avai;labe in  
> the
> AVR which will be cointrolling the RF card...only about 5% of
> itsresources are tied up in collecting the data stream from 4 uCs,  
> each
> doing ADC on 32 channels of sensor data (2000 12 bit
> samples/sensor/second, total).  Going to implement a 16 bit data bus
> betwixt all the processors on the PCB (cheating, I know, but serial
> links just didn't look fesasible).
>
>    So, what say ye, freinds and mentors?  Any suggestions, pointers to
> documents from which I can learn needed information/skills,  
> criticisms,
> condemnations, proposals for committment, etc., etc?
>

Rather than doing it yourself, why not just pick up one of the Digi  
International all-in-one serial-to-(wireless)tcp server-in-a- 
connectors? They look pretty simple.

The Digi DC-WME-01T-S, for instance, is $130 (qty.1) and is entirely  
self-contained:
http://www.mouser.com/catalog/625/102.pdf

> tom
> (aka avrFreak on eFnet IRC network)
>
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> Yahoo! Groups Links
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