[time-nuts] Oncore 1pps driver & LED

[Hal Murray]

> I'd like to put an LED near the Oncore module that blinks on the 1pps.
>  What's the best way to wire this up? 

Some GPS boxes turn off the PPS signal when they don't have enough good satellites.

For those, a PIC works well as a LED driver:  on solid when PPS is flapping, blinking when PPS is not changing, off when there is no power.

Obviously you can use your favorite tiny CPU.  I happened to have a PIC programmer handy.

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