The Humidity Sensitive Relay Module 5V is a self-contained switching module that automatically controls a load such as a fan, humidifier, or misting pump based on humidity levels. With its built-in HR202 humidity sensor and adjustable humidity set-point, this relay module is ideal for greenhouses, aquariums, mushroom farms, and smart home automation projects in Bangladesh.

Easy to use, the module only requires 5V power—no microcontroller is needed. Just connect your AC or DC load, adjust the potentiometer, and the relay will automatically switch ON/OFF depending on the relative humidity.

Features:

• Built-in HR202 humidity sensor for automatic control

• Adjustable humidity threshold with onboard potentiometer

• Relay switching capacity: up to 250VAC @ 10A or 15VDC @ 10A

• LED indicator shows relay status (ON/OFF)

• Works with 5V power supply

• SPDT relay output (NO, NC, COM) for flexible applications

• Compact PCB with M3 mounting holes for easy installation

• No microcontroller required – simple plug-and-play operation

Specifications:

• Operating Voltage (Vcc): 5V DC

• Relay Contact Rating:

  • DC: up to 15V @ 10A (recommended max 15V)

  • AC: 115V AC @ 10A / 250V AC @ 10A

• Current Draw: ~80mA (relay energized)

• Sensor Type: HR202 Humidity Sensor

• Output Type: SPDT (NO / NC / COM terminals)

• PCB Dimensions: 50 × 27 × 18mm

• Mounting Hole Size: M3 standard

Applications:

• Greenhouse automation – auto exhaust fan or humidifier control

• Aquarium rooms – maintain stable humidity levels

• Mushroom farming – control misting systems

• Smart home projects – auto humidity control for living spaces

• DIY electronics and Arduino projects

• Agricultural automation – humidity-based pump or fan switching