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        Grove - Laser PM2.5 Sensor (HM3301) The Grove - 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.     Features  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 Specification Item Value  Operating Voltage  3.3V / 5V  Operating temperature  ‐10～60Ԩ  Operating humidity  10%～90%RH (non‐condensing)  Partical size  3 channels‐‐ 2.5µm, 5µm, 10µm  Range  (PM2.5 standard value)  1~500µg/ m3 (Effective range)  1000 µg/ m3 (Maximum range)  Resolution  Concentration: 1µg/ m3   Counting concentration: 1s/0.1L  Stability time  30 seconds after power‐on  Interface  I2C  I2C address  0x40  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 Pin Out 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.     Platforms Supported Arduino Raspberry Pi  BeagleBone    Wio    LinkIt ONE      Caution The platforms mentioned above as supported is/are an indication of the module's hardware or theoritical compatibility. We only provide software library or code examples for Arduino platform in most cases. It is not possible to provide software library / demo code for all possible MCU platforms. Hence, users have to write their own software library. Getting Started Play With Arduino Hardware       Materials required Seeeduino V4.2 Base Shield    Grove ‐ Laser PM2.5 Sensor (HM3301)    Note 1 Please plug the USB cable gently, otherwise you may damage the port. Please use the USB cable with 4 wires inside, the 2 wires cable can't transfer data. If you are not sure about the wire you have, you can click here to buy 2 Each Grove module comes with a Grove cable when you buy. In case you lose the Grove cable, you can click here to buy.  Step 1. Connect the Grove - Laser PM2.5 Sensor (HM3301) to port I2C of GroveBase Shield.  Step 2. Plug Grove - Base Shield into Seeeduino.  Step 3. Connect Seeeduino to PC via a USB cable. Note If we don't have Grove Base Shield, We also can directly connect this module to Seeeduino as below.       Seeeduino Grove Cable  Grove ‐ Laser PM2.5 Sensor (HM3301)  GND  Black  GND  5V or 3.3V  Red  VCC  SDA  White  SDA  SCL  Yellow  SCL  Software Attention If this is the first time you work with Arduino, we strongly recommend you to see Getting Started with Arduinobefore the start.  Step 1. Download the Seeed_PM2_5_sensor_HM3301 Library from Github.  Step 2. Refer to How to install library to install library for Arduino.  Step 3. Restart the Arduino IDE. Open the example, you can open it in the following three ways： a. Open it directly in the Arduino IDE via the path: File → Examples → PM2.5 sensor → basic_demo. b. Open it in your computer by click the basic_demo.ino which you can find in the folder XXXX\Arduino\libraries\Seeed_PM2_5_sensor_HM3301master\examples\basic_demo, XXXX is the location you installed the Arduino IDE. c. Or, you can just click the icon in upper right corner of the code block to copy the following code into a new sketch in the Arduino IDE.     1#include "Seeed_HM330X.h" 2 3#ifdef ARDUINO_SAMD_VARIANT_COMPLIANCE 4 #define SERIAL SerialUSB 5#else 6 #define SERIAL Serial 7#endif 8 9 10HM330X sensor; 11u8 buf[30]; 12 13 14const char *str[]={"sensor num: ","PM1.0 concentration(CF=1,Standard particulate matter,unit:ug/m3): 15", "PM2.5 concentration(CF=1,Standard particulate matter,unit:ug/m3): ", 16 "PM10 concentration(CF=1,Standard particulate matter,unit:ug/m3): ", 17 "PM1.0 concentration(Atmospheric environment,unit:ug/m3): ", 18 "PM2.5 concentration(Atmospheric environment,unit:ug/m3): ", 19 "PM10 concentration(Atmospheric environment,unit:ug/m3): ", 20 }; 21 22 23err_t print_result(const char* str,u16 value) 24{ 25 if(NULL==str) return ERROR_PARAM; 26 27 SERIAL.print(str); 28 SERIAL.println(value); 29 return NO_ERROR; 30} 31 32/*parse buf with 29 u8-data*/ 33err_t parse_result(u8 *data) 34{ 35 u16 value=0; 36 err_t NO_ERROR; 37 if(NULL==data) return ERROR_PARAM; 38 39 for(int i=1;i