If you are trying to avoid writing code, the 74hc5555 might be worth taking a look at.
On Tue, Nov 15, 2016 at 3:00 PM Chuck / Judy Burch <[email protected]> wrote: > > I'm building a laboratory scintillation counter that uses my HP 5335a > counter as a read-out. The FREQ mode gives only approximate results > (maximum gate time is about 5 seconds). The TOT mode counts pulses for > an arbitrary time that can be set using the "external arm input" on the > rear panel. So I need a timing pulse (of either polarity) of known and > adjustable width (time). One way to do this is with a PIC frequency > divider taking the counter 10MHz output down to 1 PPS following that > with two or three ripple counters to get a 1 - 5 - 10 - 50 ... > sequence. That I understand. > > How do I get a pulse to start with a push button and then stop for > example 500 or 10,000 seconds later? > > > _______________________________________________ > 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. > _______________________________________________ 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.
