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Battery level indicator - Tri-colour?

Discussion in 'Hobby Electronics' started by Jason S, Jun 10, 2005.

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  1. Jason S

    Jason S Guest

    Hi,

    I want to use a tri-colour LED (or maybe just 3 different coloured LED's) to
    monitor the output voltage of a circuit, to tell me if the voltage is normal
    (green), too low (amber), or too high (red).
    I have seen the "Bi-colour LED battery voltage indicator", but was wondering
    if there is such thing as a 3-stage indicator rather than just a 2-stage.



    I would like some links or schematics to assist me. I haven't had much luck
    using search engines.



    Thanks in advance.
     
  2. Kevin Martin

    Kevin Martin Guest

    You mean like this one from Jaycar

    <http://www1.jaycar.com.au/productVi...2=K&pageNumber=&priceMin=&priceMax=&SUBCATID=>

    Kevin Martin
     
  3. Mikegw

    Mikegw Guest

    For three colours you only need two leds, consider what happens when both
    are on.

    Search for "window detectors".

    How about something like this. I will set something up for a car battery.
    To make up some numbers say one detector(A) turns on below 12 V. The
    other(B) turns off below 10V.
    Now with a bicoloured led hook A to the red led, B to the Green.

    Batt V DetectA Detect B Colours
    9 ON OFF RED
    11 ON ON RED + GREEN= AMBER?
    13 OFF ON GREEN

    I know that the problem with this system is that Green now becomes the
    colour for overvolt, but it gives you a start.

    HTH

    Mike
     
  4. Jason S

    Jason S Guest

  5. Jason S

    Jason S Guest

    Umm ok, that sounds like a start I suppose. I'll check it out later on.
    Thanks =)
     
  6. dmm

    dmm Guest

    Jaycar have an RGB led for $5.95 (ZD-0270).
    You could also use a bi-colour led. Use the green and red for the normal and
    high functions, then oscillate the signal to the led to create amber for the low
    indicator.
     
  7. Jason S

    Jason S Guest

    Thanks. I'll take that into consideration, as I've read that a 3-pin package
    is not as common as the 2-pin. Easier to install on a PCB also. Now all i
    need is a good battery level circuit that will control it for me! I'm
    looking for a schematic as I want to be able to twink with the
    components/operation. Like I want to be able to control the low, normal and
    high voltages with precision, if possible. e.g. 13.6V.
     
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