12V machine data collection [RE-wrenches]

[John Raynes]

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Ken & Chris,

Hobos will work, they're the cheapest data logger going by far and pretty 
simple to deploy.  They don't have a lot of data resolution, though, since 
they only use 8-bit data converters.  What this means is that you need to 
have the full scale range of your current sensors pretty closely matched to 
the peak currents that you want to measure.  Otherwise your data 
measurements will be a lot coarser than most of us have come to expect 
these days.

John Raynes
RE Solar
Torrey UT
435-425-2110
www.re-solar.com


At 10:55 AM 3/5/04 -0600, you wrote:
>Looking for ideas to collect power used on a small 12VDC agricultural machine.
>
>We need to collect some data on a prototype used in the field. I recall 
>seeing an HP article about using the HOBO units with current flow sensors. 
>Does this make sense for the prototype data collection?
>
>If this all works we'll eventually want to add a user 'fuel gauge' on the 
>machine. Do you think the simple volt meter schemes are acceptable? This 
>is a LOW power machine, less than 50W.
>
>ken
>
>Ken & Chris Hulet
>Engineering Services Co.
>P.O. Box 4
>Blanchardville, WI 53516
>
>608.523.3726
>
>http://www.revolutionearth.com

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