ShillehTek W1209 12V digital temperature controller module with sensor probe attached

W1209 12V Digital Temperature Controller Thermostat Module

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W1209 12V digital thermostat module for precise heating and cooling control, featuring a waterproof 50cm NTC probe and a high-current 10A relay for direct control of heaters and fans.

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Overview

Product Overview

The W1209 12V digital temperature controller is a compact, cost-effective module for automating heating or cooling in DIY projects. A bright 3‑digit LED display shows real‑time temperature while simple controls let you set precise trigger points for reliable, set‑and‑forget operation. The firmware supports HEATING & COOLING MODES so the relay can be configured to switch a heater when cold or a fan when hot, and adjustable hysteresis helps prevent rapid cycling. It ships with a 50 cm waterproof NTC probe and the onboard relay is rated for up to 10 A (120 VAC / 14 VDC), making it suitable for incubators (stable 37.5°C), brewing setups, and basic overheating protection for electronics.

Questions & answers

Frequently asked questions

The W1209 is a standalone 12V thermostat relay module, so an Arduino, Raspberry Pi, or ESP32 is not required. In microcontroller projects, it can independently switch a heater or fan while the controller handles other tasks.
It ships with a 50 cm waterproof NTC temperature probe, onboard relay, LED display, and button controls. Provide 12V power, connect the probe and load wiring, then set the trigger point, mode, and hysteresis on the module.
The module is powered from 12V and switches loads through its onboard relay. The relay is rated up to 10 A at 120 VAC or 14 VDC, so wiring and connected loads must stay within those limits.
Yes. The W1209 supports heating mode and adjustable hysteresis, making it suitable for incubator control, including stable 37.5°C setups when paired with an appropriate heater, enclosure, and safe wiring practices.
Relay chatter usually happens when the measured temperature hovers near the trigger point. Increase the hysteresis setting and place the probe where it measures the actual controlled area, away from direct heater or fan blasts.

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What's included

Features & Specs

12V Power Supply Operates from a standard 12V DC supply for easy integration into DIY projects.

Digital LED Display Bright 3-digit LED shows real-time temperature readings for quick monitoring.

Heating/Cooling Modes Configurable firmware allows the relay to activate either heating or cooling devices.

Waterproof NTC Probe Includes a 50cm waterproof NTC sensor suitable for aquariums and liquid tanks.

High-Current Relay Onboard relay switches loads up to 10A (120VAC/14VDC) for lamps and motors.

Adjustable Hysteresis Programmable temperature differential prevents rapid on/off cycling of equipment.

Incubator Ready Stable control supports maintaining the 37.5°C range commonly required for egg incubation.

Reference

Documents

Full Product Manual ShillehTek W1209 12V Digital Temperature Controller Thermostat Switch Module | ShillehTek Product Manual In-depth setup guide with wiring, code examples, and troubleshooting.

Datasheet

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