[time-nuts] precision timing pulse

[Scott McGrath]

You could build a simple one shot using something like a 555 timer IC 

Or take a input pin from your PiC and use the RTC to drive a routine which changes state of the pin for the duration of test

Content by Scott
Typos by Siri

> On Nov 15, 2016, at 1:57 PM, Chuck / Judy Burch <ciandjaburch at gmail.com> 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?
> 
> 
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