Subject:
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Re: Battery drain just to run a program?
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 23 Oct 2002 22:42:56 GMT
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Original-From:
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Steve Baker <sjbaker1@airmail.%Spamless%net>
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Viewed:
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806 times
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waltncatewhite@attbi.com wrote:
> Why? It seems like powering the LCD should take minimum
> battery power, and the motor was only on for a total of
> four seconds total during the three days of operation.
>
> Does it take a lot of battery power just to run a leJOS
> program?
Yes - most ultra-low power devices actually shut down most of
the CPU circuitry for most of the time...just waking up when
something interesting happens.
Your CPU was running at full speed the whole time.
Imagine something like a GameBoy handheld video game. That
has an LCD display and a CPU of comparable power to the RCX...and
not much else - and it's batteries last for only a few hours of
continuous play.
I think it's rather suprising that your batteries lasted as
long as they did.
---------------------------- Steve Baker -------------------------
HomeEmail: <sjbaker1@airmail.net> WorkEmail: <sjbaker@link.com>
HomePage : http://web2.airmail.net/sjbaker1
Projects : http://plib.sf.net http://tuxaqfh.sf.net
http://tuxkart.sf.net http://prettypoly.sf.net
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Message is in Reply To:
 | | Battery drain just to run a program?
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| I built a simple clock that displays the minutes and seconds on the LCD and chimes the hours by striking a triangle (the musical instrument) by running a motor for 20 thousanths of a second, as suggested by the Drummer example in the Farrari book. I (...) (22 years ago, 23-Oct-02, to lugnet.robotics)
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