I want to enable selecting between two different modes in my project. Basically one is a long period and the other is shorter. I want to use a simple spst switch on a digital pin with the internal pullup resistors. This works well because it will keep the correct mode even if reset.
I have a slight concern about leaving the switch on all the time. Is that a potential problem?
I think it's probably a non-issue but I'm experienced enough to know that assuming things is less reliable than checking with people who know better.
It's a non-issue, just microamps flow if the switch is closed with the internal pull-up enabled, and no current flow if the switch is open.