Skip to content
No description, website, or topics provided.
Branch: master
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Type Name Latest commit message Commit time
Failed to load latest commit information.
examples/basic_demo arduino file Aug 31, 2018
License.txt statement Aug 30, 2018
Seeed_HM330X.cpp driver file Aug 31, 2018
Seeed_HM330X.h driver file Aug 31, 2018
keywords.txt Use correct field separator in keywords.txt May 31, 2019

PM2.5 Sensor(HM3301)

-- HM-3301 is a new generation of dust detection sensor based on laser theory introduced by our company, which is used for continuous and real-time detection of dust in the air.



The HM-3301 is applicable to products and application fields such as dust detector, intelligent air purifier, intelligent air conditioner, intelligent ventilation fan, air quality detection, haze table, environment monitoring, etc.


  1. Download all the source files and open one of example,compile,upload,and running.Open the corresponding Serial Port to watch the result.
  2. Example: open the file examples/basic_demo/basic_demo.ino.This is the three-way test, which can measure the concentration content of three levels :PM1.0,PM2.5,PM10.


  • The sensor metal housing should not be short-circuited with other external panel circuits or product housing because the sensor housing is conducting with the internal power source.
  • When applying with purifier or fixed detection equipment, the position of sensor should be higher than 20cm above the ground.Otherwise, it is likely to be polluted by large dust particles or even floccules near the ground, resulting in the winding resistance of the fan.Refer to doc/HM-3300&3600datasheet.doc to get more detail.


Datasheet:refer to HM-3300&3600datasheet.doc

This software is written by downey for seeed studio and is licensed under The MIT License. Check License.txt for more information.

Contributing to this software is warmly welcomed. You can do this basically by
forking, committing modifications and then pulling requests (follow the links above
for operating guide). Adding change log and your contact into file header is encouraged.
Thanks for your contribution.

Seeed Studio is an open hardware facilitation company based in Shenzhen, China.
Benefiting from local manufacture power and convenient global logistic system,
we integrate resources to serve new era of innovation. Seeed also works with
global distributors and partners to push open hardware movement.

You can’t perform that action at this time.