[Rack] [Noisebridge-discuss] minotaur is down

Ben Kochie ben at nerp.net
Fri Jul 5 23:44:22 UTC 2013

The other option is we could upgrade the atmega boards to 
bulit-in-ethernet.  Then we can address them over the network, and PoE 
power them.

I have a spare PoE arduino board I'm not using.


On Fri, 5 Jul 2013, Jake wrote:

> what's wrong with the rs232 we're using now?  inside each keypad is an 
> atmega328 connected to a MAX232 chip, which translates the TTL serial of the 
> arduino the real +-12v RS232 for the long haul.  Also it's 300 baud.
> we don't need rs422 (whatever that is) for long runs of wire because we have 
> ethernet, and wireless (thanks to you)
> a nice thing about RS232 is that the computer at the end of it already has 
> the transciever built in.
> if you want to play with obscure data transmission stuff, find me a router or 
> two with DS3 ports, so we can use these QAM16 modulators to beam stuff 
> long-distance!
> -jake
> On Fri, 5 Jul 2013, Adrian Chadd wrote:
>> On 5 July 2013 16:18, Jake <jake at spaz.org> wrote:
>>> well, the payphone is one physical serial port, and the upstairs keypad is
>>> another.  These are important because they are actual RS232 lines running
>>> long distances (like in the 1970's) and they are pretty mission-critical
>>> (literally in the mission) and the extra USB-serial layer would suck for
>>> that.  so i'm glad we don't need to do that.
>> rs232 over long distance? why not just whack up RS422 and an Arduino?
>> I wonder if I should acquire some rs422/rs485 stuff and build some
>> long distance (100s to a couple thousand feet) long bus topology of
>> arduinos. Would there be any interest in a talk/demo of that kind of
>> stuff?
>> Adrian
>> (Yeah, i did a stint in control systems.)

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