Smart Humidifier Control Box with Arduino Sensor Automation

I previously built a simple humidity-controlled AC humidifier using a low-cost Arduino-compatible microcontroller and a humidity sensor, but the circuit was exposed on a bare board. This time, I repackaged the entire system into a power-outlet box purchased from a hardware store. Thanks to the enclosure, it’s now safer, easier to carry, and much more convenient to install anywhere.

My next goal is to send the current temperature and humidity data to an iPhone and enable remote control of the target humidity level.