home automation question

[Itay Donenhirsch]

On Wed, Apr 21, 2010 at 4:04 PM, Erez D <erez0001 at gmail.com> wrote:

>
>
> On Wed, Apr 21, 2010 at 3:55 PM, Itay Donenhirsch <itay at bazoo.org> 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.
>>
>>
> thanks. but it still seems too expensive and time consuming.
>

np, but it can be fun to build such a thing.


>
>
>> <http://tuxgraphics.org/electronics/200606/article06061.shtml>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?
>>
>
> 1. i have ethernet. i do not have rs232. that's what i have.
>

Do not have rs232? What the world had come to...


> 2. rs232 specs say it is for 15meters (which is too short anyway)
>
You can easily build a repeater using a single MAX232.


> 3. only one computer can connect to an rs232. so i need to set up a server
> for the rs232 <-> ethernet, which i do not want to.
>
> You can connect rs232 to a computer which have ethernet, etc..

Ofcourse that all what i've written is only if you got the time, and I agree
ethernet is much sexier :)

You can always get an Arduino with an ethernet shield (ps, i hate arduinos
but that's for another discussion), gives you all you want I guess.

Itay
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