Project Hub /IoT & Connected Devices/Smart Home & Building Automation/How to Make Homemade Portable Automatic Humidifier

Intermediate

ESP8266

Project Specific

3 – 6 Hours

Partial Kit

How to Make Homemade Portable Automatic Humidifier

Build a portable automatic humidifier using an ESP8266 and HTS221 humidity sensor to maintain optimal humidity levels in labs, greenhouses, or storage rooms.

Originally published on ElectronicsForU

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

NodeMCU ESP8266 WIFI development board based on CP2102 Rs. 660.00
Ultrasonic Sensor Module HC-SR04 Rs. 89.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

We don't carry yet: Temperature Sensor (generic)
USB Host / Programmer (ISP/USBasp)
HTS221 humidity

Browse all components

How It Works

The portable automatic humidifier system operates by continuously monitoring environmental conditions and adjusting moisture output in real-time. At the heart of the system is the ESP8266 microcontroller, which communicates with the HTS221 humidity and temperature sensor using digital protocols to gather precise ambient data. The ESP8266 processes this incoming sensor data against a pre-defined threshold programmed through the Arduino IDE. When the ambient humidity drops below the desired level, the microcontroller activates the ultrasonic humidifier module or pot-shaped humidifier, typically via a switching transistor or relay interface. The ultrasonic module then uses high-frequency vibrations to aerosolize water, creating a fine mist that increases room humidity. Powered by a stable 5V power source, the entire circuit relies on secure connections made with connecting wires, while initial programming and debugging are handled via a programmer board or FTDI adapter connected to the ESP8266. This closed-loop interaction ensures that the environment maintains a consistent humidity level without manual intervention.

Why Build This

Design and deploy an automated environmental control loop suitable for maintaining strict moisture ranges in biological laboratories or indoor greenhouses.

Gain practical engineering experience integrating digital sensors, microcontrollers, and fluid-dispensing actuators for agricultural or storage applications.

Develop a portable, networked-capable embedded system prototype using the ESP8266 platform that can scale to larger monitoring arrays.

Real-World Application

Maintaining precise humidity ranges in indoor greenhouses, agricultural plantations, laboratories, and storage rooms.

Skills You'll Learn

Microcontroller programming

environmental sensor integration

digital communication protocols

automated control logic

power management for embedded systems

Safety Precautions

Ensure electrical connections are properly insulated and safely isolated from direct contact with water when placing the ultrasonic humidifier module in water.

Frequently Asked Questions

Why is an ESP8266 used instead of a standard basic microcontroller?

The ESP8266 provides robust processing power and integrated capabilities that make it well-suited for reading digital sensors and managing automated control loops, with the potential for future wireless expansions.

How does the HTS221 sensor communicate with the ESP8266?

The HTS221 interfaces with the microcontroller using standard communication lines, allowing the ESP8266 to poll temperature and relative humidity data via the dedicated HTS221 library in the Arduino IDE.

Can I power the ESP8266 and the ultrasonic humidifier from the same 5V source?

Yes, provided the 5V power source can supply sufficient current for both the microcontroller board and the high-draw ultrasonic module without experiencing voltage drops.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

PRJ-00713