SM-PWM-01C PM2.5 Dust Sensor Module

The SM-PWM-01C is an optical dust sensor module designed to detect airborne particulate matter such as smoke and dust. It uses infrared detection and outputs particle concentration information through a PWM signal, making it suitable for air quality monitoring and smoke detection systems.

Key Features

• Optical infrared dust detection method

• Detects fine and coarse particulate matter

• PWM (low pulse) signal output

• Distinguishes particle size and concentration by pulse width

• Built-in airflow generation using internal heating resistor

• Compact and lightweight module

• Lead-free and RoHS compliant

Technical Specifications

• Model: SM-PWM-01C

• Sensor Type: Optical infrared dust sensor

• Input Voltage: DC 5V ±5%

• Power Consumption: Less than 100 mA

• Signal Output: PWM low pulse output

  • High level: greater than 4.5V

  • Low level: less than 0.7V

  • Input impedance: 200 kΩ

• Detection Particle Size: Greater than 1 µm

• Detection Concentration Range:

  • 0.01 to 2.0 mg/m³

  • Equivalent particle count: 40,000 to 800,000 at 1 µm

• Operating Temperature: -10 to 65 °C

• Operating Humidity: Below 95 percent RH

• Storage Temperature: -30 to 80 °C

• Dimensions: 59 x 45 x 20 mm

• Weight: Approximately 30 g

• Minimum Startup Time: 30 seconds

• Country of Origin: Made in China

Applications / Use Cases

• Indoor air quality monitoring

• Smoke detection systems

• Air purifiers and air filters

• Air conditioners and ventilation systems

• Dust monitoring devices

• Embedded and environmental sensing projects

Package Includes

• 1 x SM-PWM-01C dust sensor module

Notes / Warnings

• Allow at least 30 seconds warm-up time after power-on

• Measure dust concentration using the low pulse duty cycle

• Recommended averaging time is 5 to 30 seconds

• Do not clean with alcohol, acetone, or organic solvents

• Do not disassemble the sensor

• Avoid installation in areas with strong airflow

• Not suitable for humid environments or steam-heavy locations

• Cannot distinguish between water vapor particles and dust