@hek About to make this sensor, very cool! I had already brought a 12v traffic light before I saw this, so now ordered an LED ring, as that makes a lot more sense getting closer to the target area. But could you help out regarding the implementation of the timeout, as I'm pretty terrible at programing 
Hi,
I had an idea, for anyone entering the contest, and for anyone that has ideas, but not the knowhow could post it here too
So some people have used V_text to send a temperature from the controller to a node with an LCD display. Which I'm still planning on implementing my self.
But for something more interesting that could be implemented, are gauge displays or something like the following:
http://hackaday.com/2015/12/07/old-school-analog-meters-tell-you-the-weather/
https://learn.adafruit.com/raspberry-pi-physical-dashboard/overview
cheers
Larry
I think a stink sensor, with a red flashing light on the outside door is the way to go. Lol or an auto spray after you leave...
Re: LCD displays
One thing that is missing from my sensors build part is an LCD node, say I have a temperature sensor in the garage and want to display it on an LCD node in the kitchen. There are many projects that have an LCD display but nothing simple for the non programmer like me
Thank you
@Boots33 Have you thought about sending the days available. i.e. calculate daily usage and divide that by the water that is still available? would have to roll the numbers i.e. say take the last two weeks of how much the water dropped in a day averaged out... if that makes sense.