DIY Air Humidifier


Humidity, or the amount of water vapor in the air, is an important variable in maintaining indoor quality of air. Air that is too dry or too humid can have various effects ranging from increased bacterial/fungal growth to aiding in the spread of airborne infections. It is therefore prudent to have control over humidity in order to maintain optimum levels for you and your family’s wellbeing.Optimum Levels

For this project, we build a smart humidifier by making it able to detect whether the air is too humid or too dry and have it act accordingly. We will use a DHT22 humidity/temperature sensor as an upgrade to an old project, a WiFi Thermostat with scheduler which will serve as a platform.

The WiFi thermostat was designed to have a scheduling function so that you can control when to turn on the humidifier, since you probably won’t want it to be on when nobody is around or turn it on in advance while you’re heading home.

Since the WiFi thermostat we patterned this project from is powered by a  ESP8266 WiFi SoC, we have considerable online control over the entire project including an very user friendly UI.

Humidifier Set-Point

Similar to how you schedule the thermostat, you can also schedule the humidifier to be able to access it anywhere while viewing accurate readings in real time. Aside from the UI, an ultra-cheap I2C OLED is there to show information on current readings if you don’t have access to the UI.

The original humidifier was limited with just an on and off function, but now it is able to detect what a room needs and act accordingly.

Another awesome thing about this project is your readings can be inserted into Thingspeak for visual analysis (graphs are always a good idea) which can be set up from the main menu. You can monitor trends over extended periods of time and compare levels so you can further improve on the project.

DIY Air Humidifier

Ultimately, the project is a great example of what the Internet of Things (IoT) is capable of and is well worth checking out. This addition to the collection of devices that share data and are connected over by the IoT continue to add value to our daily lives.


WiFi Thermostat with scheduler -