Just read VAD or VDD.
Note that the DS2438 must be powered. It is possible to power off the data
line, but that needs an external capacitor.
Paul Alfille
On Fri, Apr 27, 2012 at 3:50 PM, lapa leves <lapale...@gmail.com> wrote:
> Hello,
>
> I'm a very satisfied user of owfs for temperature measurements. Yet, I
> would
> need now to read voltages and DC currents (1-15A range). For the later I
> got a
> DS2438 and a Devicecraft hall-effect sensor. The resulting ~1A@12Vsensitivity
> would be satisfactory for me.
>
> So, I have attached the DS2438, and the hall sensor to it. I have checked
> and
> the sensor delivers the expected 0.01V offset when 0.5A flows. I have got
> also
> the folder for the 26.x device shown in my Ubuntu 10.04 machine when owfs
> is
> executed.
>
> Now I'm totally lost as a noob. I expected this would be simple like for
> the
> temp sensors, just to read files via "cat". But this seems to be more
> tricky,
> and after a lot of searching I still did not find any step-by-step guide
> how to
> get VAD measurements.
>
> I would appreciate any information directing me to the desired result. I'm
> very
> excited if this will work out.
>
> Many thanks,
>
> lapa
>
> PS: Just for the sake of record: for measuring 12V DC currents I used a
> dismantled car fuse, and a DS18S20 pushed onto the "hot wire" part so far.
> In a
> rather permanent temperature environment this showed an around 0.5A
> resolution.
> Of course the offsets have a delay and a heat up-cool & down curve, but the
> integral fits and the offsets can be calibrated if necessary. Now I would
> try
> the real thing.
>
>
>
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