Hello,

I've completed a small hardware and software project and I wanted to share
it with other piclist'ers. I bought a cheap UPS that doesn't have an AC
power monitering output that I could hook to my PC, so I've ended up making
one. The software assumes Linux/Unix, but the hardware is OS agnostic. Only
a serial port is needed for the PC interface.

All of the information can be gotten at
http://roland.sw.edu/matthew/powermon/ and if that host doesn't resolve (as
it has been known to do for some people when I've posted here) the IP
address is 164.106.190.246.

I would be interested for folks to look over the schematic for me. Analog
design isn't my strong point and while the circuit works there is one point
of its operation I'm not happy with. I would like the output of the circuit
to match as much as possible the full RS-232 voltage swings. When AC power
is present the output is 8-9 volts, but only goes as low as -1 volt without
AC power. I would like the negative voltage swing to be greater, but I've
not thought of a good way to do that yet. Input would be welcome.

If this is useful to anyone let me know! I really like this list thanks to
all who participate.

Matthew.

-- 
"To teach superstitions as truth is a most terrible thing."
   --  Hypatia of Alexandria (370? - 415 CE)

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