Subject:
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Re: Basement water alarm
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 3 Feb 2000 13:22:35 GMT
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Original-From:
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Brian B. Alano <alano@kiva.!AvoidSpam!net>
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Viewed:
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2123 times
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Do you mean that my alarm clock follows the 60 Hz carrier? That confuses me--
I once programmed my Timex/Sinclair Z80 to be a clock based on the power line
carrier. It kept terrible time. I assumed it was because of the inaccuracy of
the carrier.
"Alan G. Smith" wrote:
> Assuming you're not being rhetorical, it has to do with the 60 Hz carrier
> through your power lines.
> From: Brian B. Alano <alano@kiva.net>
> >
> > > 2. The RCX clock seems to lose time, roughly
> > > (very roughly) a half hour per week. Anyone
> > > else noticed this?
> > >
> > >
> > PC clocks tend to lose time as well. 10 minutes a day isn't unheard of.
> > 1/2 hour per week is better than I expected: 99.7% accurate. On the
> > other hand, my $15 alarm clock keeps good time. Why the difference?
______________________
You hear, O LORD, the desire of the afflicted; you encourage them, and you
listen to their cry --Psalms 10:17
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Message has 1 Reply:
 | | Re: Basement water alarm
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| (...) I'd think it has an accurate crystal oscillator. (...) No, the frame counter in the ZX80/81/Spectrum (if yours is a ZX80 rather than 81, I'd like to buy it, BTW) simply counts the TV frames it produces. Those, in turn, would be about 60Hz in (...) (25 years ago, 3-Feb-00, to lugnet.robotics)
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Message is in Reply To:
| | Basement water alarm
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| Hi everyone, I made my first practical Mindstorms invention a couple of weeks ago. It's a water sensor for my basement. There's a water pump on the side of my furnace that takes condensed water and spits it out the back of my house. In very cold (...) (25 years ago, 2-Feb-00, to lugnet.robotics)
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