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idea for battery level indicator

Discussion in 'Electronic Design' started by John Doe, Jun 22, 2009.

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  1. John Doe

    John Doe Guest

    I do not doubt this has already been implemented, so I'm not
    suggesting it is novel.

    Why don't analogue battery level indicators show full until the
    battery discharges to a certain point? Then they could (maybe) change
    colors and then begin decreasing from full.

    In other words...

    .... start with a battery level indicator bar

    .... have that bar remain the same color and appearance until the
    battery level drops to 50% or whatever

    .... at that point, change the color to red/whatever, and begin
    indicating further discharge by decreasing the length of the bar

    The problem is real estate and LED electricity usage. That way you can
    use a shorter bar and change the bar's appearance only when the
    battery level is important. Most people can remember that they have
    recently charged the device. Before taking the device on a long trip
    or whatever, it should be left in the charger anyway. In other words,
    knowing that the device is full or nearly full is mostly useless, so
    there is no need to waste the space and energy by indicating that. The
    user mainly needs to know when to start looking for a charger.

    Too many devices do not give enough warning before the battery needs
    to be charged.
  2. IanM

    IanM Guest

    If its a LED bar graph its not an analog level indicator. Provided its
    reasonably consistent, the continuous drop of the indicated amount
    remaining is extremely valuable as its easy to estimate time remaining.
    LED bar graphs are power hogs. A non-backlit LCD one can have
    negligable power consumption and much finer segments in less space and a
    single tricolour LED to flash (low duty cycle) amber then red for low
    battery and green when charging then steady green when in float mode at
    full charge can alert the user while remaining energy efficient.

    NOTHING is worse than a gauge which indicates full till the battery is
    over half gone if you are away from base or easy charging. I have a
    couple of devices that do that and they are all a PITA and result in me
    carrying spare batteries. Ever driven on a long trip with a fuel gauge
    that showed full when it wasn't then started dropping suddenly? Its
    always so much fun wondering if you can make the next service station .
    .. .

    No doubt someone will like the idea - after all it got into a camera and
    some hand-held radios I use, but I'd suggest they've never been more
    than an hour from the nearest mains socket!
  3. John Doe

    John Doe Guest

    I do not feel like playing semantics. Whatever it takes, think
    "analog display".
    That depends on size, Jack. Apparently you missed the point.
    That is might be one reason why size matters. The main reason is
    electronic device screen real estate.
    That's good unless you are constrained by space, or if the device
    sucks energy. I probably should not have suggested the meter power
    consumption would matter.
    So make it when the battery is half gone.
    I am not talking about dropping suddenly. I am talking about
    efficient use of meter size/space on an electronic device.

    When you are driving on a long trip between gas stations, you fill
    up your tank first. Watching the fuel gauge during the first half of
    the trip between gas stations is nearly pointless. In fact, few
    people pay attention to the gas gauge until it indicates less than
    half full.

    That analogy is weak because a car dashboard has lots of space and
    has no problem with meter size.
    Get a car with better electronics, a bigger gas tank, or one that
    gets better mileage.
  4. Phil Allison

    Phil Allison Guest

    "John Doe is a Fucking TROLLING LIAR"
    ** They already do - you stinking LIAR.

    All the popular re-chargeable cell types have near constant voltage

    ** 100% WRONG .

    The problem is that simple ( electronic) battery guages do not indicate
    remaining capacity.

    ** A state of charge / remaining capacity meter for any of the popular
    re-chargeable cell types is an impossible thing to build. So they do not

    Piss off - you FUCKING WANKER .

    ...... Phil
  5. John Doe

    John Doe Guest

    This foulmouthed regular troll must be related to Rod Speed...
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