Tmr1

[andybarrett1]

Hmmmm...

Back to drawing board then..

TY for help.... least now I know I cant do it....

or use a 555 on outside of pic lol

[Art]

You said in your other thread you're using GPS,
You can easily know how long it was since someone pushed a button.
Rather than use timer1 which might mess with software serial at a low
crystal frequency, I would ignore GPS time which might not be present,
and just count serial bursts which should arrive each second.

Count 1200 serial bursts no matter what the content and go to sleep.

[Art]

...Reset the count to zero any time a button is pushed (meaning someone is using it and they get a new 20 minutes).
Looks like editing posts is turned off.

I read again, and it wasn’t GPS, but you have “PAUSE 400” in a subroutine you’re calling, so you could increment a count
to a bit more than double the 1200 in that routine.