On Apr 21, 2010, at 3:55 PM, Itay Donenhirsch wrote:
hi
if you already mentioned avr and would like to build things yourself
then you can definitively build it yourself, see
tuxgraphics.org/electronics/200606/article06061.shtml (you'll need
an enc28j60 as well).
you can buy avrs through ebay/digikey/mouser or in israel either
arihav or some stores in shdreot bnei zion, ta.
a question though - why ethernet of all things? why not lay an
rs-232 cable (avrs got internal uart for that) + max232 for the
voltages and be done with it?
Real RS-232 (+- 12v) fades out at about 25 feet. The incorrect
implementation (+5/0v) fades out after 2-3 meters.
10/100 BaseT is supposed to be good for 100 meters, however many of
the cheap chipsets are not reliable at that distance. One hub I once
saw advertised (and I have since forgotten which one) proudly stated
that it had 1 port that would work to 100 meters, unlike most that
would not, nor the other ports on it.
Geoff.
--
geoffrey mendelson N3OWJ/4X1GM
Jerusalem Israel [email protected]
New word I coined 12/13/09, "Sub-Wikipedia" adj, describing knowledge
or understanding, as in he has a sub-wikipedia understanding of the
situation. i.e possessing less facts or information than can be found
in the Wikipedia.
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