Is it possible to trigger camera intervals on a switch, but ardu controls the interval?

I’m wondering if its possible to setup camera trigger on a switch that triggers interval shots. IE. I want to drive around in manual mode, but flip a switch and the camera starts taking photos every 1 second controlled by ardupilot and referencing the trigger gps position for later batch process geo tagging. Is this possible? I have some areas that I would feel better flying manual around instead of running a mission.