AVR-Chat

Is the multipoint protocol available for studying it ?
Jeronimo
--- In AVR-Chat@yahoogroups.com, "Qboll" <msg_qboll@h...> wrote:
> Hi,
>  
> I use this one with home made Multipoint protocol for my home
> automation:
> http://www.lprs.co.uk/pdf_directory/23861049807229.pdf
>  
> Nice and simple to use.
> Only negative is the delay of ca. 25ms between send (master) and 
receive
> (slaves).
>  
> Greetings 
>  
> Pascal
>  
> -----Original Message-----
> From: James Russo [mailto:jr@h...] 
> Sent: maandag 6 december 2004 19:21
> To: AVR-Chat@yahoogroups.com
> Subject: Re: [AVR-Chat] Multinode Radio Link
>  
> Here are some companies to check out:
> 
>     RFM (RF monolithics)  http://www.rfm.com/
>     ChipCon    http://www.chipcon.com/
>     and LINX technologies. http://www.linxtechnologies.com/
> 
> The LINX modules are very easy to use. Most of these you will need 
to 
> design your own media access control to prevent collisions, etc.
> 
> hope this helps.
> 
> -jr
> 
> jeronimoavelar wrote:
> 
> >
> > Hi List ,
> > I am with a request of a client to construct 20 small terminals
> > (keypad + lcd 16x2 ) using microcontrollers conected to a central
> > server via a low-cost wireless link (simultaneous use).
> > What kind of multinode radio link do you suggest to use?
> > Is there any one using zigbee that could tell something about it?
> > Thanks in advance ,
> > Jeronimo.
> >
> >
> >
> >
> >
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At 10:52 PM 6/12/04 -0000, you wrote:
>
>
>Is the multipoint protocol available for studying it ?

I guess you could just use an half duplex, RS485 type protocol.
Simply replace the wires with radio modules....well of course if it
works let us know, I may need to do something similar in the future :-))

Regards

John Samperi

******************************************************
                        Ampertronics Pty. Ltd.
  11 Brokenwood Place Baulkham Hills, NSW 2153 AUSTRALIA
         Tel. (02) 9674-6495       Fax (02) 9674-8745
               Email: samperi@ampertronics.com.au
                 Website  http://www.ampertronics.com.au
* Electronic Design   * Custom Products   * Contract Assembly
******************************************************

If you are not using zigbee or bluetooth, you nead to add something like 
manchester coding ontop
of your RS485 protokoll. See :
http://en.wikipedia.org/wiki/Manchester_code


Svenn

>
> At 10:52 PM 6/12/04 -0000, you wrote:
>>
>>
>>Is the multipoint protocol available for studying it ?
>
> I guess you could just use an half duplex, RS485 type protocol.
> Simply replace the wires with radio modules....well of course if it
> works let us know, I may need to do something similar in the future :-))
>
> Regards
>
> John Samperi
>
> ******************************************************
>                        Ampertronics Pty. Ltd.
>  11 Brokenwood Place Baulkham Hills, NSW 2153 AUSTRALIA
>         Tel. (02) 9674-6495       Fax (02) 9674-8745
>               Email: samperi@ampertronics.com.au
>                 Website  http://www.ampertronics.com.au
> * Electronic Design   * Custom Products   * Contract Assembly
> ******************************************************
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>

Manchester coding is not really necessary.
The Nordic VLSI chips can be direcly connected a microprocessor UART.
I've used the nRF401 in several projects that way. It offers 19200 kbps 
transfer
speed at decent distances.
One project was a timing system for car races where the measuring stations 
for
start, stop and mid timing was using this module for communication with the 
main
application on a PC.
The RF modules worked as a direct replacement for the RS-485 network which
we could also use.

/Jesper

----- Original Message ----- 

From: "Svenn Dahlstrøm" <svenn@symetrics.no>
To: <AVR-Chat@yahoogroups.com>
Sent: Tuesday, December 07, 2004 11:21 AM
Subject: Re: [AVR-Chat] Re: Multinode Radio Link


>
> If you are not using zigbee or bluetooth, you nead to add something like
> manchester coding ontop
> of your RS485 protokoll. See :
> http://en.wikipedia.org/wiki/Manchester_code
>
>
> Svenn
>
>>
>> At 10:52 PM 6/12/04 -0000, you wrote:
>>>
>>>
>>>Is the multipoint protocol available for studying it ?
>>
>> I guess you could just use an half duplex, RS485 type protocol.
>> Simply replace the wires with radio modules....well of course if it
>> works let us know, I may need to do something similar in the future :-))
>>
>> Regards
>>
>> John Samperi
>>
>> ******************************************************
>>                        Ampertronics Pty. Ltd.
>>  11 Brokenwood Place Baulkham Hills, NSW 2153 AUSTRALIA
>>         Tel. (02) 9674-6495       Fax (02) 9674-8745
>>               Email: samperi@ampertronics.com.au
>>                 Website  http://www.ampertronics.com.au
>> * Electronic Design   * Custom Products   * Contract Assembly
>> ******************************************************
>>
>>
>>
>>
>>
>> Yahoo! Groups Links
>>
>>
>>
>>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>

Manchester coding is not really necessary.
The Nordic VLSI chips can be direcly connected a microprocessor UART.
I've used the nRF401 in several projects that way. It offers 19200 kbps
transfer
speed at decent distances.
One project was a timing system for car races where the measuring stations
for
start, stop and mid timing was using this module for communication with the
main
application on a PC.
The RF modules worked as a direct replacement for the RS-485 network which
we could also use.

/Jesper

----- Original Message -----