humidity control - by boiling water

Projects General Guidance
1

hello everyone,
i'm trying to think of a cheap way to control the level of humidity entering a small size box (about 604050 cm).

the general idea is that i have a box and i'm investigating condensation rates within the box, and i want to do it for a range of input air humidities.

so far i just covered the area surrounding the air entry hole with a nylon and placed underneath it an electric cooker (very weak power) and a pot filled with water.

i want to do something more robust, and i was wondering if it will be possible to program an arduino with a DHT22 at the air entry point to regulate the power of the heater so that i will have steady humidity of input air.
meaning i could just type in the code a specific Relative Humidity and the arduino will start tuning the heating power until it reaches the desired level, then just make sure it stays constant.

i guess my main question is-
what kind of heater do you think i might be able to control using an arduino (and how?)

also, is there anything i'm not thinking about that might interfere with my idea?

thank you very much!

2

The ability of air to carry water is based on temperature

Humidity can easeasily Be changed by dropping temperature.
If you have a hot box at 50% RH and cool it the humidity will increase.

Lots of ways to change humidity.
Another is to blow air aacross a cotton washrag.

But yes you can play with air flows and temperatures and .watet and heatets with an arduino

3

I think you will also want to look into a more accurate, faster, and generally more reliable sensor than the DHT22 to measure humidity. Such as the BME280.