Hi, @martinscribens
Welcome to the forum.
What PIR?
Can you please post your code in code tags as described in the instruction above?
Can we please have a circuit diagram?
An image of a hand drawn schematic will be fine, include ALL power supplies, component names and pin labels.
Can you please list ALL your hardware.
I know its a lot, but we need this information to give you good information.
Thanks.. Tom...