Subject:
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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 17:26:17 GMT
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Original-From:
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waltncatewhite@attbi&AvoidSpam&.com
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Viewed:
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706 times
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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 started with a fresh set of batteries. It kept good
time and
chimed the hours for three days, then the batteries went
dead.
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?
Walt
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Message has 2 Replies:
 | | Re: Battery drain just to run a program?
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| (...) 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 (...) (22 years ago, 23-Oct-02, to lugnet.robotics)
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