On 5/1/16 1:26 PM, jimlux wrote:
On 5/1/16 12:26 PM, Bill Baker via time-nuts wrote:
My problem: I'd like some kind of off-the-shelf device that can take
the time code and switch on or impulse another circuit-- specifically
I'd like to trigger a 180 year-old fog bell (I'm a lighthouse nut as
well, www.henryisland.com) on the hour and maybe be able to impulse my
minute school clocks. I'm not at this group's technical level, so
it's got to be pretty easy to program. So I need a box that I can
program with SMPTE time in and a timed switch impulse out. Any ideas?
Many thanks,
W1BKR
An Arduino or Teensy (http://www.pjrc.com) are both trivially easy to
program and have easy interfaces (With a large number of off the shelf
interface widgets like relays, optoisolators, etc.). There's probably
off the shelf code and hardware interfaces for decoding your SMPTE or
other time codes.
In fact
http://forum.arduino.cc/index.php?topic=8237.0
https://hackaday.io/project/7694-arduino-timecode-smpte-ltc-reader-generator-shield/log/27289-stripped-down-ltc-reader-code-for-arduino
references someone decoding SMPTE from an audio signal.
But are you sure you want SMPTE... Do you have a source already?
Seems to me you'd want something like a GPS receiver.. equally easy.
I've got code the reads a Garmin GPS-18 on a teensy somewhere around,
and I'm sure others have stuff for basically any GPS receiver made.
Lately, i've just been logging 1pps from various sources using the teensy.
After all, don't you want your fog bell to be accurate to fractions of a
microsecond, because otherwise you're not really a time-nut <grin>.
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