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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


    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


    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

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


  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
  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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