Re: [avr-chat] GPS based digital clock

[Royce Pereira]

Hi Chris,

On Tue, 10 Jul 2007 21:50:14 +0530, Chris Albertson <address@hidden> wrote:

>
> What kind of a clock?  You mean one you'd put in a home or
> office that displays the time and only needs to be accurate to a few
> milliseconds
>
Yes, one that shows the time of the day.

>
> If the first case it is almost trivial.  The GPS transmits the time of
> day once per second as ASCII serial text.  You can find the details if
> you
> google for two terms "gps" and "nmea".  NMEA is the name of the
> signal the GPS sends.  It's just 4800bps ascii but it's not quite
> rs-232 voltage levels but half the time "close enough"
>
I assume thats 4800 'bytes' ps (baud)? I'll also google as suggested.

Thanks for the info!

--Royce
>
>
> --- Royce Pereira <address@hidden> wrote:
>
>> Hi all,
>>
>> I'm looking for info on designing a clock using a GPS
>> synchronisation.
>> I have build clocks in the past, using an AVR & a watch crystal. Its
>> only the GPS aspect that's vague to me.
>> I searched Google, but the info seems too scattered & inconclusive.
>>
>> Has anyone completed/undertaking such a project? Can you share some
>> pointers on this?
>>
>> Thanks,
>> --Royce.
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>
>
> Chris Albertson
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