Richard, I don't have any GPS units. I have lots of PICs. Thanks, rich! On 7/18/2014 2:13 AM, Richard Prosser wrote: > A lot of GPS units will put a 1 pulse per second out. If you can find th= e > correct pin. A flip-flop would convert this to 1 second on - one second o= ff > if required or a monostable to required pulse width.. High accuracy as lo= ng > as it can see at least one satellite. > > RP > > > On 18 July 2014 18:52, NOPE9 YES wrote: > >> On 2014m07d17, at 23:33, Richard R. Pope wrote: >> >> Hello all, >> I hope someone can help me with this. I would like to output a >> pulse for one second. This pulse has to be high for one second. It opens >> a gate allowing the frequency to be counted to be applied to the counter >> gates. Then the pulse is pulled low and the counting stops. >> I want to then output another high pulse of at least 20nS in >> length. I want to be able to adjust the delay from the time that the >> count pulse goes low and when this pulse is output. It would be nice to >> have this pulse occur from say 1 second to never. I.E. the frequency >> count can be updated from once a second to it can be held indefinitely. >> So for this I would think that a potentiometer being read by an ADC >> could be used to control the update time for counting the frequency. A >> low count would allow the updating to occur very often and a high >> reading would result in no reset pulse being output. I have the picture >> in my head but I just don't know how to translate that into software to >> control the hardware. >> I was thinking that a pic16f628 would be the choice for doing this. >> Can someone please spend some time with me and help me with this? I have >> hit a wall. >> Thanks, >> rich! >> -- >> --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .