How to Use the W1209 Digital Temperature Controller
What is the W1209 Digital Temperature Controller?
Overview
The W1209 is a digital thermostat module capable of controlling temperature with an accuracy of 0.1°C. It features a 7-segment LED display, NTC temperature sensor, and relay output for controlling external heating or cooling devices automatically.
Key Features
Temperature Control Range: -50°C to +110°C Control Accuracy: 0.1°C Measurement Accuracy: 0.1°C Refresh Rate: 0.5s Input Voltage: DC 12V Output Type: Relay output (max load: 20A @ 14V DC, 10A @ 220V AC) Power Consumption: ≤35mA Temperature Sensor: NTC 10K waterproof thermistor (included) Display: 3-digit 7-segment LED Size: 48mm x 40mm x 14mm (approx.) Operating Humidity: 20-85% (non-condensing)
Pin/Terminal Details
- DC+ : 12V positive supply
- DC- : 12V negative supply
- K0 : Relay Normally Open (NO)
- K1 : Relay Common (COM)
- K2 : Relay Normally Closed (NC)
Working Principle
- Set your desired temperature limit.
- If current temperature < setpoint, relay activates (for heating mode).
- If current temperature > setpoint, relay deactivates.
- It can be configured for cooling or heating modes using parameters.
Button Functions
- SET: Enter parameter configuration or confirm settings.
- + (UP): Increase the set temperature or parameter value.
- – (DOWN): Decrease the set temperature or parameter value.
How to Wire the W1209 Temperature Controller
Power the Module:
- Connect 12V DC to the “+” and “-” terminals.
Connect the Load:
Use the relay terminals to connect your heater/cooler.
Ensure you follow safety practices when handling AC appliances.
Place the Sensor:
The included NTC thermistor should be placed in the environment where you wish to measure and control temperature.
Set the Temperature:
Press the “SET” button to configure the desired temperature.
Use “+” and “-” buttons to adjust the value.
Hold “SET” to save.
Why Use the W1209 in Your Projects?
The W1209 module helps automate temperature control, reducing manual monitoring and improving project efficiency. Whether you’re managing an egg incubator, controlling fermentation for brewing, or maintaining stable temperatures in a reptile tank, this module provides reliable performance at a low cost.
Parameter Settings (Long Press SET)
| Code | Description | Default |
|---|---|---|
| P0 | Cooling (C) / Heating (H) | C |
| P1 | Hysteresis (0.1–15°C) | 2°C |
| P2 | Upper Limit of setpoint | 110°C |
| P3 | Lower Limit of setpoint | -50°C |
| P4 | Temperature Calibration (±7°C) | 0 |
| P5 | Delay Start Time (0–10 min) | 0 min |
| P6 | High Temperature Alarm | OFF |
Calibration
If your module’s readings are offset:
Long press SET to enter settings.
Navigate to P4 using +/-.
Adjust to correct offset.
Troubleshooting Tips
If the relay is not activating, double-check the temperature setpoint and ensure your sensor is connected properly. If the display shows “LLL” or “HHH,” the sensor may be disconnected or faulty. For calibration, press and hold “SET” and adjust using “+” or “-” to match your reference thermometer.
Typical Applications
Incubators Aquariums Fermentation chambers Greenhouses Cooling fans in electronics projects Reptile enclosures
Precautions
Do not exceed the relay’s rated load. Ensure proper ventilation to avoid heating issues. Double-check wiring before powering to avoid module damage. Use a fuse for safety when controlling AC loads.
Where to Buy the W1209 Module
We recommend purchasing from a reliable source to ensure quality and genuine components.
Buy W1209 Digital Temperature Controller Thermostat Module at the best price on Ezyki with fast shipping in India.