I built a simple setup according to this tutorial using a 9v battery (in the meantime replaced it with a 120A battery): https://www.bc-robotics.com/tutorials/controlling-a-solenoid-valve-with-arduino/
Also i attached a humiditiy sensor to measure the soil-humidity. My plan is: 2 times a day (evening and morning before sunrise) wake up arduino and check humidity, if it is below a certain %, open the 12v-valve, wich i operate at 9v (like the one in the tutorial).
I read a lot about how to reduce power on the arduino and found this tutorial for the pro mini, wich seems a LOT easier than to modify the standard arduino uno: https://www.whizzy.org/2015/06/howto-very-low-power-usage-on-pro-mini-v2-arduino-clone/
Now, my question is: would a pro mini v2 work as well for controlling the valve? On the uno, i have the vin-pin wich provides the 9v for the valve, on the pro mini instead, as far as i understood, i need to use that pin (named RAW pin there) as power supply for the arduino... but how would i get out the 9v from the arduino like i did on the uno? Is there any possibility at all?
Thanks in advance!