AVR-Chat

Hi

Sorry if these questions were asked before. I am making a battery operated
circuit with an atmega8515 inside. The system will have  a 16x2 LCD. So
it´ll be in sleep mode as soon as it finishes the task.

How can the system measure the remaining power of the battery?
How can the system know how long the battery is going to last?.

Please, if someone can give some hints or links I ´d apreciate it.
Thanks in advance,

Javier

On Sat, 28 May 2005 09:25:57 -0400 you wrote:

>
>
>
>
>Hi
>
>Sorry if these questions were asked before. I am making a battery operated
>circuit with an atmega8515 inside. The system will have  a 16x2 LCD. So
>it´ll be in sleep mode as soon as it finishes the task.
>
>How can the system measure the remaining power of the battery?
>How can the system know how long the battery is going to last?.
>
>Please, if someone can give some hints or links I ´d apreciate it.
>Thanks in advance,

You could use the analog comparator. Compare the battery with a couple of
resistors to drop the voltage with the regulated power for the avr similarly
dropped.
--
Ralph Hilton
http://www.ralphhilton.org
C-Meter: http://www.cmeter.org
FZAOINT http://www.fzaoint.net