On Thu, Jun 30, 2011 at 1:38 AM, Achim Vollhardt <[email protected]> wrote: > Time-Nutties, > > how about using a small uC (PIC/AVR) clocked with 100ns instruction speed. > Start = 1PPS from GPS, Stop = 60 Hz Edge? Use internal capture hardware to > count processor cycles in between.
Recently posted plots show that all you need is an AC wall wart transformer and two resistors. a uC is total overkill The xformer and resistor voltage divider works because by dumb luck the pin in the rs232 port was designed to accept a signal that looks a lot like low voltage AC and even better, already has edge detection built in. Also by dumb luck someone already wrote the software to monitor the pin's status and time stamp transitions. This really is a case of pure luck. -- 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.
