I'm Humidibot! OK because I'm ganna leave now!
2 water level sensors, a nano, a relay, a voltage regulator... and no more filling!
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Nice moisty-boy. How does it warn you if there is a leak?
It doesn't yet. I have a huge water handling equipment project I'm bringing into the grow room soon and I will set up those leak cutoff switches with the paper discs.
I totally just threw some code at it, I did this whole thing on my lunch break, but it could be limited in output duration by software to limit potential damage. The valve is normally closed.
Consider a yf-s201 or other cheap flow sensor and a shut-off valve where the water is joined to the hard pipe. Add an esp8266 and you've got an IoT or wifi accessible sensor.
So the flow rate is not very high. There is technically a safety, in that the blue line (alkaline R/O water) runs from under the kitchen sink across the house into the grow room, and the head lift on an empty tank is not enough to push water through that line. So leaking out 3 gallons of R/O reserve is the worst thing that can happen there and the system only produces like 10 gallons a day anyway.
Those hall effect water sensors require some pressure which I don't have much of. It is enough to fill a 5 gallon bucket but not quickly, a 1/4 pex line running 35-40 feet and not under city pressure, the filter pressure after the R/O membrane being the cap which is very minimal pressure if any, the tank pressure is what pushes it.
I think an easier way would just be to put the humidifier in a tray and put a paper disc cut-off switch on it.
Not to mention, what you see there cost maybe ~20 bucks. Adding more sensors and connectors and adapters would double it at least..
If your RO unit has one of those things that adds back alkalinity, then you need to get water for the humidifier from BEFORE that. The alkalinity it adds is the same minerals that form the scale on the humidifier. Those minerals do not evaporate with the water and aren't doing you any good in there other than to crud up your humidifier.
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