Stock XH-W1209 DC 12V Digital Temperature Controller W1209

A compact and easy-to-use XH-W1209 digital temperature controller designed for precise temperature monitoring and control. Operating on 12V DC, this module features a built-in relay and NTC temperature sensor, allowing you to automatically control heating or cooling devices.

With a clear digital display and simple button interface, the W1209 is perfect for DIY temperature control systems, incubators, cooling fans, and automation projects.

Key features

• Wide temperature control range with digital display
• Built-in relay output for controlling external devices
• Includes waterproof NTC temperature sensor
• Heating and cooling modes
• Adjustable temperature thresholds and hysteresis
• Simple 3-button interface for configuration
• Compact and easy to integrate

How it works

The module continuously measures temperature using the NTC sensor. When the temperature crosses your set threshold, the onboard relay automatically switches connected devices (such as heaters or fans) on or off.

Pinout & wiring

Power input

• VCC – 12V positive
• GND – Ground

Temperature sensor

• 2-pin connector for NTC sensor probe

Relay output

• COM – Common
• NO – Normally Open
• NC – Normally Closed

Tip: Use NO + COM for devices that should turn on when the temperature threshold is reached.

Specifications

Common applications

• Temperature-controlled fans and cooling systems
• Heaters and incubators
• Aquarium temperature control
• 3D printer enclosures
• Greenhouse and environmental control
• DIY automation systems

Important notes

• Requires a 12V DC power supply
• Ensure proper wiring of relay terminals when switching high loads
• Relay is rated up to 10A, but use caution with inductive loads

Tip: Set a small hysteresis value to prevent rapid on/off switching when the temperature is near the threshold.