On Thu, 27 Oct 2011, doddm2001 wrote:
> I'm using a 7250 to monitor an HVAC run-times, to characterize power
> consumption. It boots into Debian over NFS from our home network server.
>
> The server is on a UPS, and if power fails, it shuts down sanely after a
> few minutes. But the 7250 is not on a UPS, so it would just die when
> power fails.
>
> In another application, I booted into TS-Linux and mounted everything
> read-only,, but I can't do this with the HVAC monitor -- it writes to
> files on the server.
>
> My program opens and closes each file for every write operation, so there
> are no continuously-open files hanging around waiting for the power to
> fail.
>
> Am I at risk of corrupting the server's file system if the 7250 dies? If
> so, what should I do to protect it?
Add your own backup supply.
On the 7260 5 or 6 AA NiMH cells, a couple of diodes, a resistor and a
spare ADC port and some code are really all that are necessary. I believe
the 7250 needs a regulated 5V supply like the 7200?
On my 7200 I have a DC-DC 1A converter provide power fed from a 12V DC wall
wart, and 6 AA NiMH cells, a couple of diodes, a resistor and a spare ADC
port and some code. When the 12V from the wall wart disappears the NiMH
cells provide power, the code sees the 12V disappear and does an orderly
shutdown.
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