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RE: [Electronics_101] Re: Data logger

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  • Vijay Raju
    Thanks. The average woman prefers beauty over brains because the average man can see better than he can think. -Vijay ... From: manifold
    Message 1 of 50 , Sep 25 10:20 PM

      Thanks…

       

      The average woman prefers beauty over brains because the average man can see better than he can think.

      -Vijay

       

      -----Original Message-----
      From: manifold [mailto:manifold_1@...]
      Sent: Thursday, September 26, 2002 10:42 AM
      To: Electronics_101@yahoogroups.com
      Subject: [Electronics_101] Re: Data logger

       

      I'll finish testing it and post the results with construction
      details. Probably about two weeks if all goes well.

      --- In Electronics_101@y..., "Vijay Raju" <vijayxraju@s...> wrote:
      > I need it around the end of October.

      > The average woman prefers beauty over brains because the average
      man can
      > see better than he can think.
      > -Vijay

      > -----Original Message-----
      > From: manifold [mailto:manifold_1@y...]
      > Sent: Thursday, September 26, 2002 10:26 AM
      > To: Electronics_101@y...
      > Subject: [Electronics_101] Re: Data logger

      > I did just finish a design based on the Maxim MAX713 that is
      designed
      > to charge NiMH batteries from a car battery. The idea is that I
      > needed something to charge my batteries when I go camping. How soon
      > do you need it?
      >
      >
      >
      > --- In Electronics_101@y..., "Vijay Raju" <vijayxraju@s...> wrote:
      > > Hi,
      > > 
      > > Thank u all for the valuable suggestions. Maybe I should
      elaborate
      > on
      > > the "data logger". The unit has a GPS module and a an LCD, These
      > are the
      > > two power hungry devices. These two alone under full operation
      pull
      > > about 150 - 165 mA at 5V. The rest of the components including a
      > > microcontroller, memory and a UART draw about 20 mA. I have tried
      my
      > > level best to reduce the power consumption but this is as far as
      I
      > could
      > > get. I want to carry this unit on treks, cycling trips etc. A
      > friend is
      > > planning to go on a kayaking expedition in a few days and he
      would
      > like
      > > to take it along too. Basically I would like this unit to work
      > without a
      > > recharge or change of batteries for about an 8 - 10 hour period.
      > > 
      > > I would also like to know if it is possible to charge a lead-acid
      > or a
      > > Ni-MH battery using the battery in a car because finding
      > electricity in
      > > rural India (my friend intends to spend nights in villages during
      > his
      > > expedition) is not an easy proposition.
      > >  
      > > 
      > >
      > > The average woman prefers beauty over brains because the average
      > man can
      > > see better than he can think.
      > >
      > > -Vijay
      > >
      > > 
      > >
      > > -----Original Message-----
      > > From: CTC [mailto:ctc@2...]
      > > Sent: Wednesday, September 25, 2002 8:20 PM
      > > To: Electronics_101@y...
      > > Subject: [Electronics_101] Data logger
      > >
      > >
      > > Vijay Raju wrote:
      > >
      > > "I have designed a small data logger which uses about 200mA @ 5V"
      > >
      > > This is a rather heavy load for a battery to handle.  I'd use a
      > small 6
      > > Volt
      > > lead-acid gel-cell (stacking two or three silicon diodes in it's
      > output
      > > line
      > > to drop the voltage).  Any other sort of battery would too
      quickly
      > go
      > > dead,
      > > and if you wish to operate this devise for more than a couple of
      > yours,
      > > you'll need to go to a larger battery.  Would it be feasable to
      > redesign
      > > the
      > > device to reduce it's current requirements?
      > >
      > > A fully charged 6 volt lead acid battery produces 6.9 VDC, thus
      > three
      > > silicon diodes in series with it's output would reduce the
      voltage
      > by
      > > approximately 1.8 VDC resulting in an output of 5.1 VDC.  If the
      > circuit
      > > can
      > > handle a slightly higher applied voltage, on the order of 5.7 VDC
      > then
      > > two
      > > diodes should be sufficient to reduce the voltage, and will
      sustain
      > the
      > > circuit for a slightly longer time.
      > >
      > > I did a quick google search on gel-cells to get an idea of how
      they
      > > would
      > > sustain your circuit.  The smallest I could find has this
      > description:
      > >
      > > 6 volt, 0.5 AH SLA
      > > Discharge Current @ 20 hr. rate - 25 mA, Length - 2.24 in. or 57
      mm,
      > > Width -
      > > 0.55 in. or 14 mm, Height - 1.97 in. or 50 mm, Height Over
      > Terminal -
      > > 1.97
      > > in. or 50 mm, Approx. Weight - 0.2 lbs., Standard Terminals
      > >
      > > This battery, while quite small,  would only sustain your device
      for
      > > approximately two hours.
      > >
      > > Here's one that would power the device for over 20 hours, but it's
      > > considerably larger.
      > >
      > > 6 volt, 4.5 AH SLA
      > > Discharge Current @ 20 hr. rate - 225 mA, Length - 2.76 in. or 70
      > mm,
      > > Width - 1.89 in. or 48 mm, Height - 4.02 in. or 102 mm, Height
      Over
      > > Terminal - 4.26 in. or 108 mm, Approx. Weight - 1.95 lbs.,
      Standard
      > > Terminals
      > >
      > > By tolerating additional expense, and size, you could extend the
      > > operating
      > > time to as much as 180 hours, but this would require a 36 AH
      (Ampere
      > > Hour)
      > > battery weighing in at about 14 pounds and requiring 145 cubic
      > inches
      > > (or
      > > 2,379 cubic centimeters) of space.
      > >
      > > It becomes apparant that the size of your device will be limited
      by
      > the
      > > desired running time, but you didn't specify that parameter.  I
      hope
      > > this
      > > gives you some assistance at any rate.
      > >
      > > Don
      > >
      > >
      > >
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    • normnet2003
      Thanks Norm
      Message 50 of 50 , Jul 11, 2010
        Thanks

        Norm

        --- In Electronics_101@yahoogroups.com, Howard Hansen <hrhan@...> wrote:
        >
        > Norm, near the beginning of the book the author states all the examples
        > in the book the 1 bit SPI mode.
        >
        > Howard
        >
        > > --- In Electronics_101@yahoogroups.com
        > > <mailto:Electronics_101%40yahoogroups.com>, Howard Hansen <hrhan@>
        > > wrote:
        > > > I still recommend you purchase a copy of "SD card projects using the
        > > PIC MIcrocontroller". >
        > > > Howard
        > >
        > > Howard do you remember if the book includes SD 4 bit bus mode or only
        > > the more common 1 bit SPI mode?
        > >
        > > Norm
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