> does the motor run all the time, or in intervalls?

It runs all the time. I built one of these using a kit from Sensebrige. The results were not as good as I had hoped.

What was your issue with it? I have a bad sense of orientation, and I thought about building my own version of it, theirs is too large imho.

Also, running a motor continually seems like it would drain the battery really quick.