Re: Battery level tester.

From: John Fields (jfields_at_austininstruments.com)
Date: 10/01/04 

Date: Thu, 30 Sep 2004 19:34:43 -0500

On Thu, 30 Sep 2004 23:27:22 +0000 (UTC), "Colin Dawson"
<nospam@cjdawson.com> wrote:

>In practice it works really well, except for
>the Battery monitor, which is OK. until I add my laptop and it's hard drive
>make things go crazy.
>
>This is what I wanted to sort out, but I don't know how. My initial though
>was to add an ammeter so that when the load increases, it compensates for
>the, but you've told me that won't work. So now, I don't know how to
>compensate. 

---
I suggested several posts back that you repartition your meter or
build a new one so that you have only three LEDs to contend with:
green = OK, yellow = getting flat, and red = flat.  If you chose to
build a new one it could be arranged so that it would never blink and
would always be on only either red, yellow, or green.  It would take a
single quad comparator, a voltage reference, and a handful of
resistors to do that.  If you're interested I'll draw you a schematic.
  
-- 
John Fields

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