[time-nuts] help

Adrian Godwin artgodwin at gmail.com
Tue May 3 06:29:05 EDT 2016


Since you have an impulse clock system, you could use that to fire the bell
- you could modify a slave clock or use one of these :

http://www.ebay.co.uk/itm/111982558390

or possibly this one :

http://www.ebay.co.uk/itm/291730808914

The first seems rather expensive to me, I've more commonly seen them at
more like the second price. You can probably find one nearer to you.

You still then have the problem that you want to drive the impulse from an
accurate time source. There are impulse drivers that operate from a cheap
crystal available on ebay. I don't think we want to talk about those here.

A nicer solution would be to transform the 1pps signal from a gps receiver
into a suitable pulse : again, this is easy to do with a microcontroller
and a small amount of electronics, but it seems like a useful idea. Perhaps
worth working out properly and publishing.

I have in the past run a slave clock from an RS232 port : it needs a small
circuit to generate the current pulse (powered by the RS232 port itself)
and operated by a small script program on a computer, so locked to NTP.
However, it needs a computer (preferably Unix) running 24/7.




On Mon, May 2, 2016 at 7:11 PM, Mark Sims <holrum at hotmail.com> wrote:

> If you want to get fancy you could modify Lady Heather to do the deed.
> Heather has a "singing clock" mode and a cuckoo/chime clock mode for
> playing sound files at various times.  It also has routines for controlling
> the serial port DTR and RTS lines (currently used for PWMing a fan if
> temperature control mode is enabled).   You could add some code to the
> program to pulse the DTR or RTS line... these can easily drive a solid
> state relay.
>
>
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