SEN0121 Steam Sensor Module – High-Sensitivity Vapor Detection

The SEN0121 Steam Sensor Module is a specialized vapor-sensing unit designed to detect steam, water vapor, condensation, and high-humidity levels in kitchens, industrial plants, bathrooms, boilers, and smart home systems. Built with a corrosion-resistant sensor plate and a high-quality comparator circuit, this module outputs both analog and digital signals, making it flexible for various embedded and automation applications.

Its compact design and fast response time allow developers to integrate it easily with Arduino, NodeMcu, ESP32, Raspberry Pi (ADC required), and most microcontroller-based IoT platforms. The SEN0121 is frequently used in safety monitoring, home automation, boiler protection, anti-fog systems, and environmental sensing projects.

Designed for real-time moisture and vapor detection, this module is perfect for smart systems that need to trigger fans, alarms, buzzers, dehumidifiers, exhaust systems, or display vapor levels on dashboards.

⭐ How It Works

The SEN0121 uses a moisture-sensitive film/sensor electrode that changes resistance in the presence of water vapor or steam. The onboard LM393 comparator chip converts this change into:

• Digital Output (DO): High/Low steam detection

• Analog Output (AO): Proportional moisture/steam concentration

This dual-output system makes it suitable for both simple ON/OFF triggers and advanced data logging.

⭐ Key Features

• High-sensitivity vapor and steam detection

• Dual output: Analog (AO) + Digital (DO)

• Adjustable sensitivity via onboard potentiometer

• LM393 comparator for stable digital switching

• Fast response & stable performance

• Corrosion-resistant sensing surface

• Ideal for water vapor, steam, and condensation monitoring

• Easy integration with Arduino & IoT modules

⭐ Technical Specifications

⭐ Applications & Use Cases

🏠 Smart Home Systems

• Bathroom steam detection

• Kitchen vapor sensing

• Auto exhaust fan control

• Condensation prevention

⚙️ Industrial & Commercial

• Boiler and heater protection

• HVAC systems

• Industrial humidity monitoring

• Vapor leakage detection

🚿 Consumer Electronics

• Smart mirrors anti-fog systems

• Dehumidifier automation

• Steam-triggered alarms

🔬 DIY & Educational Projects

• Arduino vapor sensing

• ESP32/NodeMcu moisture monitoring

• Environmental monitoring stations

⭐ Usage & Integration Guide

1. Connect VCC to 3.3–5V.

2. Connect GND to ground.

3. Use AO (analog output) for real-time steam levels.

4. Use DO for ON/OFF threshold detection.

5. Adjust the onboard potentiometer to set the trigger level.

6. View readings on Arduino Serial Monitor or display modules.

Recommended Pairings:

• Arduino Boards: https://electroway.org/product-category/arduino-and-accessories/arduino-boards/

• NodeMcu IoT Modules: https://electroway.org/product-category/iot-and-smart-solutions/iot-modules/nodemcu/

• Electronics Components: https://electroway.org/product-category/electronics-components/

⭐ Precautions

• Do not immerse the sensor in water.

• Avoid corrosive chemicals or high-temperature environments.

• Steam detection varies with humidity; calibrate for accuracy.

• Keep the sensor surface clean for best performance.

• Use proper isolation when installed near hot surfaces.

⭐ YouTube Tutorial Link

Watch Video:https://www.youtube.com/watch?v=cxVu229znd4

4. Product Summary

The SEN0121 Steam Sensor Module is a sensitive, reliable, and easy-to-use vapor detection module ideal for smart home systems, industrial environments, HVAC automation, and Arduino-based IoT projects. With adjustable sensitivity, dual outputs, and fast reaction time, it is a powerful solution for steam and condensation monitoring.