Thank you. A lot of value information.
For the picture, it is solar plus a small battery.
This is whole picture.
For battery/power, this is no what I am concerned.
The point you said need a DC latch solenoid, it is new for me.
We have different farms.
Some close AC power and most setup with a timer controller. So we have all power ready. Just want to upgrade to iot remote control.
And, yes, pressure sensor will give us a good feedback to make sure it is running.
For DC latch solenoid, I saw a 5V solenoid in other farm. If just a purse to turn on switch, it should not require high current, right?