Laser PM2.5 Sensor (HM3301)

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 Laser PM2.5 Sensor (HM3301) is a new generation of laser dust detection sensor, which is used for continuous and real-time detection of dust in the air.

Different from the pumping dust detection sensor, the HM-3301 innovatively uses fan blades to drive air, and the air flowing through the detection chamber is used as a test sample to perform real-time and continuous test on dust of different particle sizes in the air.

This module is suitable for dust detectors, intelligent air purifiers, intelligent air conditioners, intelligent ventilation fans, air quality testing, haze meters, environmental monitoring and relative products and applications


  • High sensitivity on dust particles of 0.3 μm or greater
  • Real-time & continuous detection of dust concentration in the air
  • Based on laser light scattering technology, readings are accurate, stable, and consistent
  • Low noise
  • Ultra-low power consumption


Operating Voltage3.3V / 5V
Operating temperature-10~60℃
Operating humidity10%~90%RH (non-condensing)
Partical size3 channels– 2.5µm, 5µm, 10µm
(PM2.5 standard value)
1~500µg/ m3 (Effective range)
1000 µg/ m3 (Maximum range)
ResolutionConcentration: 1µg/ m3
Counting concentration: 1s/0.1L
Stability time30 seconds after power-on
I2C address0x40

Typical applications

  • Air purifier / air conditioner
  • Air quality testing equipment
  • Industrial PM value analysis
  • Dust and smoke detection and analysis
  • Real-time PM2.5, PM10, TSP detector
  • Multichannel particle counter
  • Environmental testing equipment

Hardware Overview

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Working Principle

The HM-3301 Dust Sensor is based on the advanced Mie scattering theory. When light passes through particles with quantity same as or larger than wavelength of the light, it will produce light scattering. The scattered light is concentrated to a highly sensitive photodiode, which is then amplified and analyzed by a circuit. With specific mathematical model and algorithm, the count concentration and mass concentration of the dust particles is obtained.

The HM-3301 dust sensor is composed of main components such as a fan, an infrared laser source, a condensing mirror, a photosensitive tube, a signal amplifying circuit and a signal sorting circuit.

HM-3301 Module structure diagram

Farees Ahmed

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