Grove Moisture Sensor - power usage


since sensor is connected to power source constatntly is it drawing any power when not used (trigered by analogpin read).
If it is drawing power would it make sense to conenct +5v to separate arduino pin and power pin before readouts.

I also see that readouts can show rather big oscilations (even on 5 different 1 second readouts) that I am using for averaging.
how can we overcome it ?


Jumper ports,almost all of our products,are connected to power supply directly.
So ports’ power will be always provided by power supply.
And you can install a capacitor on SIG wire if your output has a big oscilations.