Just remember that you need a voltage reference that's higher than the 3.3V one the gumstix gives you.  That is why I suggested adding your own regulator.  One way or another, you will need to do add your own regulator.

Of course, if the gumstix doesn't need to know if the batteries are low, you can just divide the battery voltage into an LED anode.  Red LED's typically drop 2.2V, so as the voltage in the batteries goes down the current through the LED will drop also, causing it to dim.

_____________________________________________
From:   gumstix-users-admin@lists.sourceforge.net [mailto:gumstix-users-admin@lists.sourceforge.net On Behalf Of John Alfredo

Sent:   Wednesday, March 15, 2006 15:47
To:     gumstix-users@lists.sourceforge.net
Subject:        RE: [Gumstix-users] low battery detection?

Yes, the Maxim stuff is exactly what I'm looking for, so I can produce a blinking icon on the LCD when the battery starts getting low...just like the pros.

Now I'm getting excited about my project!

John Alfredo

> -----Original Message-----
> From: gumstix-users-admin@lists.sourceforge.net
> [mailto:gumstix-users-admin@lists.sourceforge.net]
> Sent: Wednesday, March 15, 2006 12:36 PM
> To:   gumstix-users@lists.sourceforge.net
> Subject:      RE: [Gumstix-users] low battery detection?
>
> 1-Wire solution for Li-Ion or NiMH batteries:
> <http://para.maxim-ic.com/cache/en/results/4867.html>
>
> Interface devices for connecting 1-Wire bus:
> DS2408B (5V RS-232) or DS2482 (I2C)
> <http://para.maxim-ic.com/cache/en/results/4868.html>
>
>
> Joel
>
> -----Original Message-----
> From: gumstix-users-admin@lists.sourceforge.net
> [mailto:gumstix-users-admin@lists.sourceforge.net]
> Sent: Wednesday, March 15, 2006 10:18 AM
> To: Gumstix-Users
> Subject: [Gumstix-users] low battery detection?
>
> Does anybody know of a device that can be used to detect a low
> battery on the gumstix?  I plan to use 3-AA to power the gumstix,
> however I'm concerned about not knowing when the batteries get low. 
>
> Also, what voltage level (on the batteries) should be considered low?
>
> Thanks in advance.
>
> John Alfredo