W1209 12V Digital Temperature Controller Module With Display and NTC Temperature Sensor

W1209 12V Digital Temperature Controller Module With Display and NTC Temperature Sensor

Displaying the current temperature

The thermostat will display the current temperature in °C by default. If no input is made for approximately 5 seconds while in any other mode, it will automatically revert to this default display.

Setting the trigger temperature

To set the trigger temperature, press the button labeled ‘SET.’ The seven-segment display will begin to flash, allowing you to adjust the trigger temperature (in °C) using the ‘+’ and ‘-‘ buttons in 0.1° increments. If no buttons are pressed for approximately 2 seconds, the trigger temperature will be saved, and the display will return to showing 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 will show ‘P0,’ indicating that you are in parameter mode. You can cycle through the various parameters (P0 to P6) by pressing the ‘+’ or ‘-‘ buttons. When a desired parameter is displayed, pressing the ‘SET’ button will allow you to change its value using the ‘+’ and ‘-‘ buttons. Once you finish setting a parameter, press the ‘SET’ button to exit that option. If no buttons are pressed for approximately 5 seconds, the thermostat will automatically exit parameter mode and return to the default temperature display.

Setting the cooling or heating parameter P0

Parameter P0 has two settings: C and H. When set to C (default), the relay will activate when the specified temperature is reached, making it ideal for air-conditioning systems. Conversely, when set to H, the relay will deactivate at the target temperature, which is suitable for controlling heating devices.

Setting the hysteresis parameter P1

This setting determines the amount of temperature change required before the relay switches state. For instance, if the default is set to 2°C and the trigger temperature is 25°C, the relay will not deactivate until the temperature drops below 23°C. This hysteresis setting helps prevent the thermostat from repeatedly triggering when the temperature fluctuates around the set point.

Setting the upper limit of the thermostat parameter P2

This parameter sets a limit on the maximum trigger temperature that can be configured. It serves as a safety feature to prevent users from accidentally setting an excessively high trigger temperature.

Setting the lower limit of the thermostat parameter P3

This parameter establishes a minimum limit for the trigger temperature that can be set. It acts as a safety measure to prevent users from accidentally configuring an excessively low trigger temperature.

Setting temperature offset correction parameter P4

If you notice a discrepancy between the displayed temperature and the actual temperature—such as when the temperature probe is connected via a long cable—you can make minor adjustments to the temperature reading using this parameter.

Setting the trigger delay parameter P5

This parameter allows you to delay the relay’s switching until the trigger temperature is reached. It can be set in one-minute increments, with a maximum delay of up to 10 minutes.

Setting the high-temperature alarm parameter P6

Configuring a value for this parameter will turn off the relay when the temperature reaches that setting. The seven-segment display will show ‘—‘ to indicate an alarm condition. The relay will not reactivate until the temperature drops below this value. The default setting is OFF.

Note: The 12v relay module may differ in the manufacturer’s name & type from the image. 

Settings Chart

Long press the “SET” button to activate the menu.

(SET THE VALUES AS MENTIONED IN BRACKET)
Code Description Range Default Value
P0 Heat C/H (C)
P1 Backlash Set 0.1-15  (2)
P2 Upper Limit 110 (110)
P3 Lower Limit -39 (-39)
P4 Correction -7.0 ~ (0)
P5 Delay Start Time 0-10 mins  (0)
P6 High-Temperature Alarm 0-110  (OFF)
Long pressing “+/-” will reset all values to their default

APPLICATION 

1. To measure and display temperature
2. To Turn any application ON/OFF based on temperature reading. (Both AC and DC)
3. Example Project:- A. Fire alarm system . B. Auto cut off Electric Water Heater

Features 

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

Specification:

• Temperature Control Range(°C): -50 to +110
• Resolution @-9.9°C to +99.9°C: 0.1°C
• Resolution @all temperatures: 1°C
• Accuracy: 0.1°C
• Refresh Rate(s): 0.5
• Supply Voltage(V): 12
• Measuring Inputs: NTC10K
• Cable Length: 0.5 Meter
• Output Type: 1 Channel Relay Output
• Capacity: 10A

Package Includes

1 x W1209 12V Digital Temperature Controller Module With Display and NTC Temperature Sensor

Datasheet

Video