5v/12v Humidity switch relay module (White)

Description

Description

The 5V/12V Humidity Switch Relay Module (White) is a versatile, dual-voltage humidity controller designed for automation projects and environmental monitoring. Unlike single-voltage units, this white module accepts either 5V DC or 12V DC input, making it compatible with USB power banks, Arduino systems, PLCs, or standard 12V industrial supplies. The module features a high-sensitivity humidity sensor, a clean white LCD backlit display, and a robust relay output that switches external devices such as exhaust fans, humidifiers, dehumidifiers, water pumps, or alarm systems.

With a simple two-button interface, users can set an exact humidity trigger point and choose between humidification or dehumidification modes. The relay status is indicated by a bright LED, and the compact white enclosure offers a professional, clean appearance for both DIY hobbyist projects and commercial installations. Whether you need to maintain humidity inside a 3D printer filament storage box, a musical instrument cabinet, a reptile terrarium, or a warehouse drying room, this module provides a plug-and-play solution without requiring microcontroller programming.

Key Features

• Dual Voltage Support – Operates on either 5V DC (USB compatible) or 12V DC (industrial standard).

• Selectable Working Mode – Switch between Humidify (activates when air is too dry) and Dehumidify (activates when air is too wet).

• Built-in SPDT Relay – Controls devices up to 10A / 250V AC or 10A / 30V DC.

• Clear White Backlit Display – Shows real-time humidity percentage and relay status at a glance.

• External Humidity Probe – Place the sensor exactly where needed, away from heat sources.

• One-Touch Calibration – Reset sensor reading to match a reference hygrometer.

• Hysteresis Setting – Adjustable switching differential prevents rapid on/off cycling.

• Non-Volatile Memory – Retains all settings after power loss.

Technical Parameters