On Mon, Mar 23, 2015 at 4:58 PM, Pete Stephenson <[email protected]> wrote:
> On 3/23/2015 5:20 PM, Dan Watson wrote: > > The solution I came up with is very simple but works well. I > > capacitively couple the signal into a MOSFET which triggers a > > monostable 555 circuit. This generates a nice clean ~100ms pulse that > > I send to the PI, and an LED. Because who doesn't like blinking > > LEDs? > For NTP the 555 is good enough but for any kind of precision timing (where nanoseconds mater) the capacitive coupling and 555 would introduce a LOT of noise. But NTP works at the microsecond level. I'm surprised to can't get the Pi to interrupt on the raising edge of the PPS and that you had to make the pulse longer. -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
