[lug] Ethernet Enabled PLC/Linux Microcontroller

Sean Reifschneider jafo at tummy.com
Fri Jul 31 20:46:17 MDT 2009

On 07/31/2009 07:27 AM, Swavek Skret wrote:
> (ethernet, RS-232, etc) but simply provides a binary voltage to flag that
> it functions correctly or not. I am considering using an ethernet enabled
> microcontroller with Linux OS ideally.

It sounds like a project I recently did might have some application here:


I used these XBee modules that I got from Sparkfun (in Boulder, though I
mail-ordered them).  These are wireless modules that can do mesh
networking, and have 8 I/O pins.  I think one of them can be used as an
analog input to read voltage -- I believe a recent "Make" magazine that had
the Kill-a-watt that wrote to "twitter" did this.

It's not Ethernet, but you could hook one XBee module to the computer, via
a RS-232 or USB to XBee module, and then have the other XBee module located
where you need to do the reading.  You then use serial commands to read the

I was using mine as a wireless serial pass-through, so I haven't done the
voltage reading.

Another option is that I have a volt meter that has a RS-232 port on it so
you can read data from it from a computer -- if you have a computer near
where you need to read the data.

Sean Reifschneider, Member of Technical Staff <jafo at tummy.com>
tummy.com, ltd. - Linux Consulting since 1995: Ask me about High Availability

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