Subject:
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RE: HB's mA consume?
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 1 Mar 2000 00:59:22 GMT
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Original-From:
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Chuck McManis <cmcmanis@mcmanis#antispam#.com>
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Viewed:
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828 times
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Well, you can _greatly_ increase the efficency of the handyboard if you
remove the 7805 regulator and replace it with a PowerTrends switching
regulator (Digikey sells these among others). I would suggest you run three
wires from the regulator to the board because the PowerTrends unit is
slightly larger than the 7805 (same pinout though!)
Further, if you are going to go solar then I would also suggest you ditch
the handyboard's recharger circuit and build a new one out of either a
Maxim, Linear Tech, or Microchip battery management IC. These IC's are
designed to charge/maintain a particular battery chemistry easily and
efficiently, they can detect "excess" voltage and go right into charge mode
(they are used in Cell Phones and laptop computers a lot!) and they can
give you an idea of just how much juice is left in the battery so if you
get several cloudy days in a row you can realize you're about to go offline
and take some action. Application notes are available online.
--Chuck
At 09:17 PM 2/29/00 -0300, Jose Luis wrote:
> Thanks your answer Will, well, seems not easy to give a good use to a solar
> panel in the HB
> If I want to connect the a panel to the HB charging circuit, it must be
> 12V/500mA like the AC adaptor? or with less current (maybe 200 mA) , it can
> still use that circuit?
>
> Thanks
>
> Jose Luis
>
> ----- Original Message -----
> From: William Bain <handyboard@media.mit.edu>
> To: <lugnet.robotics.handyboard@lugnet.com>
> Sent: Tuesday, February 29, 2000 7:10 PM
> Subject: Re: HB's mA consume?
>
>
> > If your calculations are correct, and your solar panel provides 40 mA, and • you get maybe 6 hours
> > of strong, useful sunlight per day, then I figure you'd need eight solar • panels and three battery
> > packs, minimum, to keep the HB running all the time, without any motors or • other devices.
> >
> >
> > --- Jose Luis <jldf@mail.com> wrote:
> > > Hi,
> > >
> > > Today I have tested the time the HB can stay powered with his battery • (just
> > > the board, without any other device attached), its work during aprox. 8 • hs,
> > > so because the batteries I use are 600 mA, I believe that the consume of • the
> > > board is around 75 mA, can it be right? or my batteries are in bad
> > > condition? Someone has made the same test before?
> > >
> > > Thank You
> > >
> > > Jose Luis
>
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Message is in Reply To:
 | | Re: HB's mA consume?
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| If your calculations are correct, and your solar panel provides 40 mA, and you get maybe 6 hours of strong, useful sunlight per day, then I figure you'd need eight solar panels and three battery packs, minimum, to keep the HB running all the time, (...) (25 years ago, 29-Feb-00, to lugnet.robotics.handyboard)
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