Battery level indicator - Tri-colour?

You mean like this one from Jaycar

Kevin Martin

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

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

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. =)

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

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.

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.