- Sun Oct 30, 2011 6:37 pm
#135139
So I have a whole-home humidifier. When the furnace is on, water showers over a filter in the furnace and it humidifies the air. The problem is that as long as the relative humidity is below the target point, the water is on. Constantly. Theres NO need for the water to be on that much.
So I'd like to build something that can sense moisture on the filter, and when it gets dry, a relay turns the water on. When its wet, it turns off.
My question is where to get a moisture sensor like that? I've seen plans for a soil moisture sensor, but the problem here is I need something that can sense surface moisture - it wont be submerged in anything. I guess I can try soldering 2 wires close together and sensing the resistance when it's wet... havent tried it yet. Wanted to ask here first.
Also would like to do this with components and NOT an arduino - would like to avoid that extra cost, but, if figuring all that out is too hard, I'll arduino it.
But, first, how to do a water sensor...
So I'd like to build something that can sense moisture on the filter, and when it gets dry, a relay turns the water on. When its wet, it turns off.
My question is where to get a moisture sensor like that? I've seen plans for a soil moisture sensor, but the problem here is I need something that can sense surface moisture - it wont be submerged in anything. I guess I can try soldering 2 wires close together and sensing the resistance when it's wet... havent tried it yet. Wanted to ask here first.
Also would like to do this with components and NOT an arduino - would like to avoid that extra cost, but, if figuring all that out is too hard, I'll arduino it.
But, first, how to do a water sensor...