HR202 Humidity Sensor Relay Module 1-Channel 5V 12V Adjustable

HR202 1-Channel Industrial Humidity Sensor Relay Module – 5V / 12V

Take precise control of your humidity-sensitive environments with the HR202 1-Channel Industrial Humidity Sensor Relay Module. Designed for makers, engineers, and automation enthusiasts, this compact relay module detects ambient humidity levels and automatically triggers connected devices when your set threshold is crossed — ideal for greenhouses, server rooms, storage areas, basements, and DIY automation projects.

With support for both 5V and 12V supply voltages and independently adjustable high and low humidity thresholds, this module gives you flexible, reliable control without complex programming. Simply dial in your desired humidity range and let the module do the work.

Key Features

• HR202 Humidity Sensor: Industrial-grade sensing element for accurate, stable humidity detection
• Dual Voltage Support: Compatible with 5V and 12V power supplies — choose the version that fits your project
• Adjustable Thresholds: Set both high and low humidity trigger points via onboard potentiometers
• 1-Channel Relay Output: Switches loads up to 250V 10A AC or 30V 10A DC — handles fans, humidifiers, dehumidifiers, alarms, and more
• Wide Operating Temperature Range: Performs reliably from -40°C to +85°C
• Compact SMD Design: Compact 50×26mm footprint (19mm thick) fits easily into enclosures and project builds
• Low Power Consumption: Dissipation power of just 150mA keeps energy use minimal
• Customizable: Module supports custom configuration to suit specific automation requirements

Specifications

What Can You Control With It?

This relay module is perfect for automating humidity-dependent devices such as:

• Humidifiers & dehumidifiers
• Exhaust fans & ventilation systems
• Grow tent & greenhouse controllers
• Basement & storage room moisture management systems
• Server room environment monitoring
• Arduino & Raspberry Pi automation projects

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Frequently Asked Questions

Q: What does the HR202 Humidity Sensor Relay Module do?

A: The HR202 1-Channel Humidity Sensor Relay Module continuously monitors ambient humidity levels and automatically activates or deactivates a connected relay when the humidity crosses your preset high or low threshold. This makes it ideal for automating humidifiers, fans, dehumidifiers, and other devices in greenhouses, basements, server rooms, and DIY automation setups.

Q: What is the difference between the 5V and 12V versions?

A: The two versions differ only in their operating supply voltage — 5V for microcontroller-based projects (Arduino, Raspberry Pi, etc.) and 12V for larger industrial or standalone control systems. Both versions share the same relay output capability (up to 250V 10A AC / 30V 10A DC) and the same HR202 sensor performance.

Q: How do I adjust the humidity threshold on this module?

A: The module features onboard potentiometers that allow you to independently set the high and low humidity trigger points. Simply turn the potentiometer using a small screwdriver until the relay triggers at your desired humidity level. No programming or external components are required.

Q: What loads can the relay on this module switch?

A: The onboard relay is rated for a maximum load of 250V 10A AC or 30V 10A DC, making it suitable for controlling most standard household and light-industrial devices such as fans, humidifiers, dehumidifiers, pumps, and alarms.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.