Control of the water fluid tank and LED alarm system. Base

Hello

I'm doing VI which has two valves of a tank. One is the input valve and the other is out. When the input valve is open, then the liquid is supposed to go up to 1 unit for each unit of time. and when the release valve is opened, and then the liquid is supposed to go down to-0.7 unit by unit of time. A green LED must be enabled when the liquid is 0<><20, yellow="" light="" when=""><><25, red="" light="" when=""><><30. now,="" if="" you="" look="" at="" my="" diagram,="" i="" think="" i="" am="" on="" the="" right="" track="" but="" the="" thing="" is="" that="" when="" both="" the="" valves="" are="" open="" then="" the="" differential="" is="" only="" 0.3="" but="" it="" is="" suppose="" to="" increment,="" instead="" of="" incrementing="" the="" value="" of="" the="" tank="" stay="">
Second problem is that when I close a faucet then my symbols add keep waiting for a value of the valve that is turned off. I can't find a way to get a zero in this node by using a sort of comparison or any other Boolean function.

I'm new to Labview and I'm really trying, I want to learn and not just ask for help but I'm stuck really bad. I do not understand what approach to take.

Any help will be appreciated.
Thank you.

modified...

Tags: NI Software

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