W1209 Digital thermostat Temperature Control Relay Switch

Description

Product Description

The W1209 Digital Thermostat Module is a compact, affordable temperature control board that uses an onboard microcontroller and an NTC thermistor sensor to measure temperature and control a relay output.
It’s widely used in DIY incubators, heaters, coolers, and other temperature-controlled systems.

Technical Specifications

• Model: W1209

• Type: Digital Thermostat Temperature Controller

• Supply Voltage: DC 12 V

• Power Consumption: ≤ 65 mA (relay off), ≤ 85 mA (relay on)

• Temperature Measurement Range: –50 °C to +110 °C

• Control Accuracy: ± 0.1 °C

• Measurement Accuracy: ± 0.5 °C

• Sensor Type: NTC 10 kΩ Thermistor (B3950)

• Sensor Cable Length: ~30 cm

• Output Type: Relay (SPST – Normally Open)

• Relay Contact Capacity: 10 A @ 12 V DC / 250 V AC

• Temperature Resolution: 0.1 °C

• Refresh Rate: 0.5 s

• Operating Temperature: –10 °C to +60 °C

• Storage Temperature: –20 °C to +80 °C

• Dimensions: 48 mm × 40 mm × 15 mm

Features

• Digital LED temperature display (3-digit, 7-segment)

• High-accuracy NTC temperature sensor

• User-programmable setpoint and hysteresis (difference)

• Selectable heating or cooling mode

• Adjustable temperature calibration (offset)

• EEPROM memory — settings saved even after power-off

• Onboard control buttons for setup and configuration

• Compact PCB design for easy installation

Control Parameters (Programmable Settings)

Typical Wiring

• VCC: +12 V DC

• GND: Ground

• Relay COM: Common contact

• Relay NO: Normally Open contact

• Sensor: 2-pin thermistor connector

Applications

• Temperature-controlled fans or coolers

• Aquarium or incubator thermostats

• Heating pads or water heaters

• Food storage temperature control

• Electronic project temperature monitoring