Capacitor on PIC output

[Michael]

Thank God -- I just figured it out and I had suspected all along it was because HIGH portX
was being called more than once ? BUT, it never went low in the code so why would would that happen?

The port output wasn't appearing as true DC and the cap was taking it to ground?

Strange though because some channels would work fine.

Anyway - problem solved.

I did some code where once the input is trggered it called a subroutine that made the output HIGH just once.

Still, I wish I knew exactly why

start

If porta.0 = 0 then
high portd.0
endif

goto start

....acts wacko with the cap

Is the high output in that case looking like a rapid pulsating DC or something?


Funny thing is -- whenever I've gotten desperate enough to use this forum -- I always figure
it out 15 minutes after I post. !!

Anyone else like that?? LOL

[skimask]

Funny thing is -- whenever I've gotten desperate enough to use this forum -- I always figure it out 15 minutes after I post. !!
Anyone else like that?? LOL

Only everyone!

[JD123]

Funny thing is -- whenever I've gotten desperate enough to use this forum -- I always figure
it out 15 minutes after I post. !!

Anyone else like that?? LOL

We are but the grease the gets the stuck wheels moving. And yes, but I don't have internet access where I code, so it's more like 1 day + 15 minutes.

[Michael]

Yeah JD123, that's part of this program -- I wait a few seconds and then make the pins inputs to see the charged cap.

16C65's because it's what I have (as in hundreds).

I guarantee though if anyone breadboards it and tries it you'll encounter the same thing.

[JD123]

Okay, Michael... I just didn't see that in your code.

[Michael]

Still would like to learn why I had that problem.

Because actually when you run code over and over again that includes HIGH it's pulsing the output pin again and again based on the instruction clocks square wave?

But when you call HIGH just once and leave the output pin alone, it's a steady DC that is stable.


start

If porta.0 = 0 then
high portd.0
endif

do other stuff

If porta.0 = 0 then
high portd.0
endif

do other stuff

If porta.0 = 0 then
high portd.0
endif

goto start

Not good when a capacitor is on the output?