Gravity: PM2.5 Air Quality Sensor V.2 (ของแท้จาก DFRobot)

INTRODUCTION

How does the sensor work?

This sensor adopts the principle of laser scattering, that is, to make the laser irradiate the suspended particles in the air to produce scattering, and at the same time collect the scattered light at a certain angle, and obtain the curve of the intensity of the scattered light with time. Furthermore, the microprocessor, based on the MIE theory algorithm, obtains the equivalent particle size of the particles and the number of particles of different particle sizes per unit volume.

FEATURES

• Laser scattering principle, accurate measurement
• Zero false alarm rate
• Real-time response and support continuous acquisition
• Minimum recognizable particle size 0.3µm
• Six-sided all-round shielding, stronger anti-interference
• Ultra-thin design, only 12mm, suitable for portable devices

SPECIFICATION

• Working Voltage: 5.0V
• Maximum Working Current: 100mA
• Standby Current: ≤2mA
• Data Interface Level: L<0.8V, H>2.7V, maximum voltage level 3.3V
• Particle Measurement Range: 0.3 ~ 1.0μm; 1.0 ~ 2.5μm; 2.5 ~ 10μm
• Particle Counting Efficiency: 50% @ 0.3μm 98% @ ≥0.5μm
• Effective Range of Particle Mass Concentration (PM2.5 standard value): 0~500ug/m³
• Maximum Range of Particle Mass Concentration (PM2.5 standard value): ≥1000ug/m³
• Resolution of Particle Mass Concentration: 1ug/m³
• Consistency of Particle Mass Concentration (PM2.5 standard value): 1. ± 10% @100 ~ 500 ug/m³; 2. ±10 ug/m³@0 ~ 100 ug/m³
• Standard Volume: 0.1 L
• Single Response Time: < 1s
• Comprehensive Response Time: ≤10s
• Working Temperature Range: -10~+60℃
• Working Humidity Range: 0~95%% (non-condensing)
• Mean Time Between Failures: ≥5 years
• Product Size: 67 mm * 40 mm * 14 mm / 2.64* 1.57 * 0.55 inches

DOCUMENTS

• Product wiki
• Tutorial

SHIPPING LIST

• Gravity: PM2.5 Air Quality Sensor V.2 x1
• Gravity-4P I2C/UART Sensor Cable x1

  
  
  Pin description

  

  Serial number	Screen printing	Function description
  1	VCC/+	Power positive
  2	GND/-	Power negative
  3	SCL/C	I2C clock line
  4	SDA/D	I2C data line

  Arduino usage tutorial

  The product uses the Gravity standard I2C interface, which is relatively simple to use. Connect the sensor to the uno (or other motherboard) as shown in the wiring diagram.

  Preparation：

  • Hardware

    • 1 x Arduino UNO control board
    • 1 x PM2.5 Air Quality Sensor
    • Several Dupont lines

  • Software

    • Arduino IDE, click to download Arduino IDE

  For how to install the library file, click the link

  • Library file: DFRobot_AirQualitySensor
  • Connection diagram

  

  • Function list

  /*!
  * @brief Get the concentration of the specified particle type
  * @param type:PARTICLE_PM1_0_STANDARD Particle concentration of PM1.0 in standard particle
  PARTICLE_PM2_5_STANDARD Particle concentration of PM2.5 in standard particle
  PARTICLE_PM10_STANDARD Particle concentration of PM10 in standard particle
  PARTICLE_PM1_0_ATMOSPHERE Particulate matter concentration of PM1.0 in atmospheric environment
  PARTICLE_PM2_5_ATMOSPHERE Particulate matter concentration of PM2.5 in atmospheric environment
  PARTICLE_PM10_ATMOSPHERE Particulate matter concentration of PM10 in atmospheric environment
  * @return concentration（ug/m3）
  */
  uint16_t gainParticleConcentration_ugm3(uint8_t type);
  /*!
  * @brief Get the number of particles per 0.1 liter of air
  * @param type:PARTICLENUM_0_3_UM_EVERY0_1L_AIR
  PARTICLENUM_0_5_UM_EVERY0_1L_AIR
  PARTICLENUM_1_0_UM_EVERY0_1L_AIR
  PARTICLENUM_2_5_UM_EVERY0_1L_AIR
  PARTICLENUM_5_0_UM_EVERY0_1L_AIR
  PARTICLENUM_10_UM_EVERY0_1L_AIR
  * @return number
  */
  uint16_t gainParticleNum_Every0_1L(uint8_t type);
  
  /*!
  * @brief Writes data to the specified register of the sensor
  * @param NULL
  * @return No return value
  */
  uint8_t gainVersion();

  Sample code-standard particle concentration

  Function description: Get the standard particle concentration of PM2.5, PM1.0, PM10.

  #include "DFRobot_AirQualitySensor.h"
  
  #define I2C_ADDRESS 0x19
  DFRobot_AirQualitySensor_I2C particle(&Wire ,I2C_ADDRESS);
  
  void setup() {
  Serial.begin(115200);
  /**
  Sensor initialization is used to initialize IIC, which is determined by the communication mode used at this time.
  */
  while(!particle.begin())
  {
  Serial.println("NO Deivces !");
  delay(1000);
  }
  Serial.println("sensor begin success!");
  delay(1000);
  /**
  Get sensor version number
  */
  uint8_t version = particle.gainVersion();
  Serial.print("version is : ");
  Serial.println(version);
  delay(1000);
  }
  
  void loop() {
  /**
  *@brief : Get concentration of PM1.0 PM2.5 PM10
  *@param :PARTICLE_PM1_0_STANDARD Standard particle
  PARTICLE_PM2_5_STANDARD Standard particle
  PARTICLE_PM10_STANDARD Standard particle
  PARTICLE_PM1_0_ATMOSPHERE In atmospheric environment
  PARTICLE_PM2_5_ATMOSPHERE In atmospheric environment
  PARTICLE_PM10_ATMOSPHERE In atmospheric environment
  */
  uint16_t PM2_5 = particle.gainParticleConcentration_ugm3(PARTICLE_PM2_5_STANDARD);
  uint16_t PM1_0 = particle.gainParticleConcentration_ugm3(PARTICLE_PM1_0_STANDARD);
  uint16_t PM10 = particle.gainParticleConcentration_ugm3(PARTICLE_PM10_STANDARD);
  Serial.print("PM2.5 concentration:");
  Serial.print(PM2_5);
  Serial.println(" ug/m3");
  Serial.print("PM1.0 concentration:");
  Serial.print(PM1_0);
  Serial.println(" ug/m3");
  Serial.print("PM10 concentration:");
  Serial.print(PM10);
  Serial.println(" ug/m3");
  Serial.println();
  delay(1000);
  }

  Result

  In the state of standard particulate matter, the concentration of PM2.5, PM1.0, PM10 read is: 45ug/m3, 31ug/m3, 49ug/m3.

  

  Sample code-particulate matter concentration in atmospheric environment

  Function description: Obtain the concentration of particulate matter in the atmospheric environment of PM2.5, PM1.0, PM10.

  #include "DFRobot_AirQualitySensor.h"
  
  #define I2C_ADDRESS 0x19
  DFRobot_AirQualitySensor_I2C particle(&Wire ,I2C_ADDRESS);
  
  void setup() {
  Serial.begin(115200);
  /**
  Sensor initialization is used to initialize IIC, which is determined by the communication mode used at this time.
  */
  while(!particle.begin())
  {
  Serial.println("NO Deivces !");
  delay(1000);
  }
  Serial.println("sensor begin success!");
  delay(1000);
  /**
  Get sensor version number
  */
  uint8_t version = particle.gainVersion();
  Serial.print("version is : ");
  Serial.println(version);
  delay(1000);
  }
  
  void loop() {
  /**
  *@brief : Get concentration of PM1.0
  *@param :PARTICLE_PM1_0_STANDARD Standard particle
  PARTICLE_PM2_5_STANDARD Standard particle
  PARTICLE_PM10_STANDARD Standard particle
  PARTICLE_PM1_0_ATMOSPHERE In atmospheric environment
  PARTICLE_PM2_5_ATMOSPHERE In atmospheric environment
  PARTICLE_PM10_ATMOSPHERE In atmospheric environment
  */
  uint16_t PM2_5 = particle.gainParticleConcentration_ugm3(PARTICLE_PM2_5_ATMOSPHERE );
  uint16_t PM1_0 = particle.gainParticleConcentration_ugm3(PARTICLE_PM1_0_ATMOSPHERE );
  uint16_t PM10 = particle.gainParticleConcentration_ugm3(PARTICLE_PM10_ATMOSPHERE);
  Serial.print("PM2.5 concentration:");
  Serial.print(PM2_5);
  Serial.println(" ug/m3");
  Serial.print("PM1.0 concentration:");
  Serial.print(PM1_0);
  Serial.println(" ug/m3");
  Serial.print("PM10 concentration:");
  Serial.print(PM10);
  Serial.println(" ug/m3");
  Serial.println();
  delay(1000);
  }

  Result

  In the atmospheric environment, the particle concentration of PM2.5/PM1.0/PM10 is about: 38ug/m3, 23ug/m3, 46ug/m3.

  

  Sample code-the number of particles per 0.1 liter of air

  Function description: Read the number of particles above 0.3um/0.5um/1.0um/2.5um/5.0um/10um per 0.1 liter of air.

  
  #include "DFRobot_AirQualitySensor.h"
  
  #define I2C_ADDRESS 0x19
  DFRobot_AirQualitySensor_I2C particle(&Wire ,I2C_ADDRESS);
  
  void setup() {
  Serial.begin(115200);
  /**
  Sensor initialization is used to initialize IIC, which is determined by the communication mode used at this time.
  */
  while(!particle.begin())
  {
  Serial.println("NO Deivces !");
  delay(1000);
  }
  Serial.println("sensor begin success!");
  delay(1000);
  /**
  Get sensor version number
  */
  uint8_t version = particle.gainVersion();
  Serial.print("version is : ");
  Serial.println(version);
  delay(1000);
  }
  
  void loop() {
  /**
  *@brief : Get particle number of 0.3um/0.5um/1.0um/2.5um/5.0um/10um per 0.1L of air
  *@param :PARTICLENUM_0_3_UM_EVERY0_1L_AIR
  PARTICLENUM_0_5_UM_EVERY0_1L_AIR
  PARTICLENUM_1_0_UM_EVERY0_1L_AIR
  PARTICLENUM_2_5_UM_EVERY0_1L_AIR
  PARTICLENUM_5_0_UM_EVERY0_1L_AIR
  PARTICLENUM_10_UM_EVERY0_1L_AIR
  */
  uint16_t um0_3 = particle.gainParticleNum_Every0_1L(PARTICLENUM_0_3_UM_EVERY0_1L_AIR);
  uint16_t um0_5= particle.gainParticleNum_Every0_1L(PARTICLENUM_0_5_UM_EVERY0_1L_AIR);
  uint16_t um1_0= particle.gainParticleNum_Every0_1L(PARTICLENUM_1_0_UM_EVERY0_1L_AIR);
  uint16_t um2_5= particle.gainParticleNum_Every0_1L(PARTICLENUM_2_5_UM_EVERY0_1L_AIR);
  uint16_t um5_0= particle.gainParticleNum_Every0_1L(PARTICLENUM_5_0_UM_EVERY0_1L_AIR);
  uint16_t um10= particle.gainParticleNum_Every0_1L(PARTICLENUM_10_UM_EVERY0_1L_AIR);
  Serial.print("The number of particles with a diameter of 0.3um per 0.1 in lift-off is: ");
  Serial.println(um0_3);
  Serial.print("The number of particles with a diameter of 0.5um per 0.1 in lift-off is: ");
  Serial.println(um0_5);
  Serial.print("The number of particles with a diameter of 1.0um per 0.1 in lift-off is: ");
  Serial.println(um1_0);
  Serial.print("The number of particles with a diameter of 2.5um per 0.1 in lift-off is: ");
  Serial.println(um2_5);
  Serial.print("The number of particles with a diameter of 5.0um per 0.1 in lift-off is: ");
  Serial.println(um5_0);
  Serial.print("The number of particles with a diameter of 10um per 0.1 in lift-off is: ");
  Serial.println(um10);
  Serial.println("");
  delay(1000);
  }

  Result

  It is read that the number of 0.3um/0.5um/1.0um/2.5um/5.0um/10um particles per 0.1 liter of air is approximately: 1615, 1356, 233, 0, 0, 0.

  

  Micro:bit usage tutorial-makecode

  The product uses the Gravity standard I2C interface, which is relatively simple to use. Connect the sensor to the micro:bit as shown in the wiring diagram.

  Preparation：

  • Hardware

    • 1 x micro:bit control board
    • 1 x PM2.5 Air Quality Sensor
    • 1 × MBT0008 micro:IO Extend micro:bit control board IO expansion board
    • Several Dupont lines

  • Software

    makecode

  How to use makecode software? MakeCode online graphical programming basic operation tutorial MakeCode basic operation tutorial

  • Library file: https://github.com/tangjie133/pxt-DFRobot_PM25_Air_Quality_Sensor （Temporary）
  • Connection diagram

  

  Sample code-standard particle concentration

  Function description: Get the standard particle concentration of PM2.5, PM1.0, PM10. Program link: https://makecode.microbit.org/_9HRJ7VTsDaM2

  

  Result

  In the state of standard particulate matter, the concentration of PM2.5, PM1.0, PM10 read is: 37ug/m3, 26ug/m3, 41ug/m3. The data printed by the serial port is as follows:

  

  Sample code-the number of particles per 0.1 liter of air

  Function description: Read the number of particles above 0.3um/1.0um/10um per 0.1 liter of air. Program link: https://makecode.microbit.org/_JMxHs15fK29r

  

  Result

  It is read that the number of 0.3um/1.0um/10um particles per 0.1 liter of air is about 1115, 160, and 0 respectively.