Peter,
Peter Harrison wrote:
>
>
> On Thu, Feb 4, 2010 at 2:32 PM, Claudio Izzi <
> <cizzi%40claudioizzi.com>> wrote:
> >
> > That was my first solution, to use the TS-7260 with the phidget
> > interface, I'm glad to hear they work well together. My concern would be
> > power efficiency, does the phidget interface + voltage sensor use up a
> > lot of watts?
>
> I've been testing power use on my boat. Sadly the Phidgets are not
> good in terms of resolution, so I can only measure with 50ma
> resolution. Running only the TS-7260 it uses about 50ma. Turning on
> USB with the Phidgets will cost about 50 - 100ma more. If this is the
> only external sensor and you are really pressed for consumption I
> would follow the advice above and wire in a sensor to the AD on the
> TS-7260. If you need more sensors however I would probably bite the
> bullet and use a Phidget.
>
> Also, if you are interested in how much battery life you have left
> voltage probably isn't that great. I use two current sensors to
> measure the incoming current from the solar panels and outgoing
> current to the consumers (SBC, Engine etc). I havn't yet factored in
> battery efficiency, and I will be adding voltage sensor to provide a
> fallback when power is really low.
>
> I'm pretty paranoid about battery health because once on the water my
> boat can't get "roadside servicing". I need to know it's battery
> condition so I can make decisions about whether to bring it back in
> before the battery dies. I have also been thinking about a sleep
> option so I can put the whole kit to sleep for a few hours at a time
> to conserve power at night. I would probably use a small PIC with a
> timer of some kind.
Have you looked into the TS-BAT3? Its expensive but it works for me.
7260 can turn itself off and ask the BAT3 to wake it up.
http://www.embeddedarm.com/products/board-detail.php?product=TS-BAT3
-Satish.
>
> I can already control the USB, turning it off and on which helps to
> some extent, and so does slowing down the CPU; also possible at
> runtime. But you are still using quite a bit of juice while in this
> sleep mode. A sleep mode with virtually zero consumption would be
> better.
>
>
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