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Battery level indicator - Tri-colour?
- 06-10-2005
June 10, 2005, 7:23 am

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.

Re: Battery level indicator - Tri-colour?
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Jason S wrote:

You mean like this one from Jaycar
<http://www1.jaycar.com.au/productView.asp?ID=KA1683&CATID=&keywords=&SPECIAL=&form=KEYWORD&ProdCodeOnly=yes&Keyword1=K&Keyword2=K&pageNumber=&priceMin=&priceMax=&SUBCATID=
Kevin Martin
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Re: Battery level indicator - Tri-colour?

<http://www1.jaycar.com.au/productView.asp?ID=KA1683&CATID=&keywords=&SPECIAL=&form=KEYWORD&ProdCodeOnly=yes&Keyword1=K&Keyword2=K&pageNumber=&priceMin=&priceMax=&SUBCATID=

hmmm, no, I'd rather not have 10 LED's. A tri-colour would be nice, or just
a green, yellow and red LED. I'm sure it's possible. But thanks anyway. =)

Re: Battery level indicator - Tri-colour?

to
normal
wondering
luck
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

Re: Battery level indicator - Tri-colour?

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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