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The W1209 is a popular temperature controller often used in various DIY projects and home automation applications. It's commonly used for controlling heating or cooling devices, like a heater, fan, or refrigeration system, based on the temperature it detects.

Here are some key features and specifications of the W1209:

1. Temperature Sensor: It typically uses a DS18B20 temperature sensor, which allows for precise temperature measurement.

2. Display: It comes with a 3-digit LED display that shows the current temperature and can also show the set temperature.

3. Relay: The controller has a relay with a 10A rating, which can handle the switching of devices that require more power.

4. Adjustable Set Points: The controller allows you to set a high or low temperature limit. The relay will switch on or off based on the temperature threshold.

5. Modes: It can be set to heating or cooling mode, depending on whether you want to heat or cool your space when the temperature crosses the set point.

6. Temperature Range: The sensor has a typical range from -50°C to 110°C, depending on the version you're using.

How it works:

• The controller continuously reads the temperature from the connected sensor.
• Once the current temperature surpasses the set threshold (either for heating or cooling), the controller activates or deactivates the connected device (e.g., a heating element or fan).

Would you like to know more about how to use it in a specific project, or are you looking for wiring/setup instructions?

The W1209 Temperature Controller Module is an affordable, all-in-one digital thermostat solution featuring a microcontroller, 7-segment LED display, relay output, and NTC temperature sensor. It enables users to set a temperature threshold with hysteresis for automatic switching of heating or cooling devices.

The module supports both Celsius and Fahrenheit modes, user-defined temperature limits, and configurable delay/startup protection settings. Simple push buttons allow parameter adjustments without programming, while the relay offers safe control for connected electrical loads (up to 240V AC or 20V DC).

Perfect for temperature-sensitive applications such as:

• Incubators

• Thermostatic fans

• Smart refrigerators

• Aquariums

• Home automation systems

Technical Specifications: