[GRLUG] Time Clocks and Software

[Ben Rousch]

On Wed, Jan 26, 2011 at 9:35 AM, L. V. Lammert <lvl at omnitec.net> wrote:
> On Wed, 26 Jan 2011, Ben Rousch wrote:
>
>> > An arduino with a 'buzzer file' on an SD card, solid state relay, and DS1307
>> > RTC would allow you to replace the timeclock relay without needing a
>> > computer to plug a usb relay into.
>> >
>> This is more along the lines of what I thought people would suggest.
>> Very interesting. My major concern with this is clock drift. Ideally
>> the clock needs to be correct to within a few seconds, or I need to be
>> able to regularly correct time via something like NTP. Also I have no
>> experience with Arduino, so there would be a learning curve.
>>
> Your 'server' would maintain the master clock - the Arduino's would just
> get the Ethernet 'relays' to sound the buzzers.
>
> Check out emacinc.com - local Illinois company specializing in Linux SBCs
> and I/O.

There is some very useful stuff on that site!

>
>> I've just started looking into plug computers, like the SheevePlug. A
>> Linux install on a wall wart, with a USB port. Maybe I can plug in one
>> of the previously-suggested USB relays and create a fairly simple
>> system. http://en.wikipedia.org/wiki/SheevaPlug
>>
> Another good option. Be a little careful, however, some of these wouldn't
> survive a manufacturing environment.
>
> The cost might be a tad higher, but for a harsh environment you can't beat
> a simple Adam module - Ethernet, RS232, or RS45 on one side, I/O point on
> the other [to drive a relay]. B&B or Advantech.

Very nice. I should be able to find something I can use here.

>
>        Lee
>

-- 
  Ben Rousch
  brousch at gmail.com
  http://ishmilok.blogspot.com/

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