Description of W1209 Temperature Controller

The W1209 Temperature Controller is an incredibly low cost yet highly functional thermostat controller. With this module, you can intelligently control power to most electrical devices based on the temperature sensed by the included high accuracy NTC temperature sensor. Although this module contains an embedded microcontroller, it does not require any programming knowledge. Three tactile switches allow for configuring various parameters, including on & off trigger temperatures. The onboard relay can switch up to a maximum of 240V AC at 5A or 14V DC at 10A. The module displays the current temperature in degrees Centigrade via its three digit seven segment display and the current relay state by an onboard LED.


Specifications Of W1209 Temperature Controller:-

  1. Temperature Control Range: -50 ~ 110 C
  2. Resolution at -9.9 to 99.9: 0.1 C
  3. Resolution at all other temperatures: 1 C
  4. Measurement Accuracy: 0.1 C
  5. Control Accuracy: 0.1 C
  6. Refresh Rate: 0.5 Seconds
  7. Input Power (DC): 12V
  8. Measuring Inputs: NTC (10K 0.5%)
  9. Waterproof Sensor: 0.5M
  10. Output: 1 Channel Relay Output, Capacity: 10A

Power Consumption

  1. Static Current: <=35mA
  2. Current: <=65mA
  3. Environmental Requirements
  4. Temperature: -10 ~ 60 C
  5. Humidity: 20-85%


  1. 48mm x 40mm x 14mm

Settings Chart

  1. Long press the “SET” button to activate the menu.
  2. Code Description Range Default Value
  3. P0 Heat C/H C
  4. P1 Backlash Set 0.1-15 2
  5. P2 Upper Limit 110 110
  6. P3 Lower Limit -50 -50
  7. P4 Correction -7.0 ~ 7.0 0
  8. P5 Delay Start Time 0-10 mins 0
  9. P6 High-Temperature Alarm 0-110 OFF
  10. Long pressing +- will reset all values to their default

Displaying the current temperature:

  • The thermostat will display the current temperature in oC by default. When in any other mode making no input for approximately 5 seconds will cause the thermostat to return to this default display.

Setting the trigger temperature:

  • To set the trigger temperature, press the button marked ‘SET’. The seven-segment display will flash. You can now set a trigger temperature (in oC) using the ‘+’ and ‘-‘ buttons in 0.1-degree increments. If no buttons are pressed for approximately 2 seconds the trigger temperature will be stored and the display will return to the current temperature.

Setting the parameters:

  • To set any parameter first long, press the ‘SET’ button for at least 5 seconds. The seven-segment display should now display ‘P0’. This represents parameter P0. Pressing the ‘+’ or ‘-‘ buttons will cycle through the various parameters (P0 to P6). Pressing the ‘SET’ button while the module is displaying any of these parameters, will allow you to change the value for that parameter using the ‘+’ and ‘-‘ buttons (see below). When finished setting a parameter, press the set button to exit that option. If no buttons are pressed for approximately 5 seconds, the thermostat will exit the parameter options and will return to the default temperature display.

Setting the cooling or heating parameter P0:

  • The parameter P0 has two settings, C and H. When set to C (default) the relay will energize when it reaches the temperature. Use this setting if connecting to an air-conditioning system. When set to H, the relay will de-energize when the module reaches the temperature . Use this setting if controlling a heating device.

Setting the hysteresis parameter P1:

  • This sets how much change in temperature must occur before the relay changes state. For example, if set to the default 2oC and the trigger temperature is set to 25oC, it will not de-energize until the temperature falls back below 23oC. Setting this hysteresis helps stop the thermostat from continually triggering when the temperature drifts around the trip temperature.

Setting the upper limit of the thermostat parameter P2:

  • This parameter limits the maximum trigger temperature that is set. We can use this as a safety to stop an excessively high trigger temperature that can accidentally be set by the user.

Setting the lower limit of the thermostat parameter P3:

  • This parameter limits the minimum trigger temperature that is set. We can use this as a safety to stop an excessively low trigger temperature that can accidentally be set by the user.

Setting temperature offset correction parameter P4:

  • Should you find there is a difference between the displayed temperature and the actual temperature (for instance, if the temperature probe is on a long run of cable) you can make minor corrections to the temperature reading with this parameter.

Setting the trigger delay parameter P5:

  • This parameter allows for delaying switching of the relay when the trigger temperature has been reached. The parameter is set in one-minute increments up to a maximum of 10 minutes.

Setting the high-temperature alarm parameter P6:

  • Setting a value for this parameter will cause the relay to switch off when the temperature reaches this setting. The seven-segment display will also show ‘—‘ to indicate an alarm condition. The relay will not re-energize until the temperature falls below this value. The default setting is OFF.


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Package Includes:

1 x W1209 Temperature Controller


Additional information

Weight 0.1 kg


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