Ok that should be an easy fix.
Yes, I recently saw power consumption numbers and indeed - I'm not worried about the radio. That is something I will rewire.
So, I believe I tried this in the past already but never got it to work. From what I read also, the current you get from an output port is quite low. I will try it again with the DS18B20 but would there be other alternatives to build a power delivery switch for the sensors?