Author Options:

How to make or salvage a humidistat and have it control a device? Answered

I'm using a portable plug-in electric kettle as a humidifier. This is it:


I have a separate little handheld hygrometer, so when I see that my room has reached a good humidity level I have to manually turn off the kettle.

My question is, what is the cheapest way to make a humidistat, even from parts salvaged from other things, and have it control this? I have experience in electronics, circuitry, soldering etc. but I don't know where to begin on this one. I can provide any info such as specs on the kettle if needed. Appreciate any ideas and thoughts!



8 years ago

Well the core of your humidistat is the sensor, which is usually quite an awkward thing.

This device from Honeywell makes it simpler

Farnell/Newark ships internationally.

The rest you could do with an arduino, or something cheaper and simpler with a couple of op-amps. You need to build a comparator with hysteresis like this.

Which I have taken from this excellent site.