The PIC can easily be programmed to be armed with a switch and stop at a
particular count, or you can use actual logic - debouncer, gating
flip-flop and programmable counter!
David N1HAC
On 11/15/16 1:57 PM, Chuck / Judy Burch 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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