PM2.5_laser_dust_sensor_SKU_SEN0177-DFRobot

Introduction

PM2.5 laser dust sensor is a digital universal particle concentration sensor，it can be used to obtain the number of suspended particulate matter in a unit volume of air within 0.3 to 10 microns, namely the concentration of particulate matter, and output with digital interface, also can output quality data of per particle. The Air Quality sensors can be embedded in a variety of concentrations of environment-related instruments suspended particulate matter in the air,to provide timely and accurate concentration data.

How it works?

This pm2.5 sensor uses a laser scattering theory. And namely the scattering of laser irradiation in the air suspended particles, while collecting the scattered light at a specific angle, to obtain the scattering intensity versus with time curve. After the microprocessor data collection, get the relationship between the time domain and frequency domain by Fourier transform, and then through a series of complex algorithms to obtain the number of particles in the equivalent particle size and volume units of different size. Each functional block diagram of the sensor portion as shown:

Specification

• Operating voltage: 4.95 ~ 5.05V
• Maximum electric current: 120mA
• Measuring pm diameter: 0.3-1.0, 1.0-2.5, 2.5-10(um)
• Measuring pm range：0~999 ug/m3
• Standby current: ≤200 uA
• Response time: ≤10 s
• Operating temperature range: -20 ~ 50C
• Operating humidity range: 0 ~ 99% RH
• Maximum size: 65 × 42 × 23 (mm)
• MTBF: >= 5 years
• Quick response
• Standard serial input word output
• Second-order multi-point calibration curve
• The minimum size of 0.3 micron resolution

Power supply quality requirements:

• Voltage ripple: less than 100mV.
• The power supply voltage stability: 4.95 ~ 5.05V.
• Power supply: more than 1W (5V@200mA).
• The upper and lower electric voltage surge is less than 50% of the system power supply voltage.

Connection

*SET: * SET = 1, the module works in continuous sampling mode, it will upload the sample data after the end of each sampling. (The sampling response time is 1S) SET = 0, the module enters a low-power standby mode. RESET: leave it empty is OK.

Tutorial

Connection Diagram

If you have an IO expansion shield, you can simply insert the PM2.5 sensor adapter onto it, and you can use the serial to monitor the data.

If you have no IO expansion shield, you can follow the wiring diagram to do wiring.

Sample Code

NOTE: This code can only be verified in ArduinoIDE 1.6.x or above.

/*!
 * @file  SEN0177.ino
 * @brief Abstract: Read value of PM1,PM2.5 and PM10 of air quality
 * @n Modified by Cain for Arduino Hardware Serial port compatibility
 * @copyright  Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @license  The MIT License (MIT)
 * @author  Zuyang @ HUST
 * @version  V3.1
 * @date  2016-03-25
 */
#include <Arduino.h>

#define LENG 31   //0x42 + 31 bytes equal to 32 bytes
unsigned char buf[LENG];

int PM01Value=0;          //define PM1.0 value of the air detector module
int PM2_5Value=0;         //define PM2.5 value of the air detector module
int PM10Value=0;         //define PM10 value of the air detector module

void setup()
{
  Serial.begin(9600);   //use serial0
  Serial.setTimeout(1500);    //set the Timeout to 1500ms, longer than the data transmission periodic time of the sensor

}

void loop()
{
  if(Serial.find(0x42)){    //start to read when detect 0x42
    delay(100);
    Serial.readBytes(buf,LENG);

    if(buf[0] == 0x4d){
      if(checkValue(buf,LENG)){
        PM01Value=transmitPM01(buf); //count PM1.0 value of the air detector module
        PM2_5Value=transmitPM2_5(buf);//count PM2.5 value of the air detector module
        PM10Value=transmitPM10(buf); //count PM10 value of the air detector module
      }
    }
  }

  static unsigned long OledTimer=millis();
    if (millis() - OledTimer >=1000)
    {
      OledTimer=millis();

      Serial.print("PM1.0: ");
      Serial.print(PM01Value);
      Serial.println("  ug/m3");

      Serial.print("PM2.5: ");
      Serial.print(PM2_5Value);
      Serial.println("  ug/m3");

      Serial.print("PM1 0: ");
      Serial.print(PM10Value);
      Serial.println("  ug/m3");
      Serial.println();
    }

}

char checkValue(unsigned char *thebuf, char leng)
{
  char receiveflag=0;
  int receiveSum=0;

  for(int i=0; i<(leng-2); i++){
  receiveSum=receiveSum+thebuf[i];
  }
  receiveSum=receiveSum + 0x42;

  if(receiveSum == ((thebuf[leng-2]<<8)+thebuf[leng-1]))  //check the serial data
  {
    receiveSum = 0;
    receiveflag = 1;
  }
  return receiveflag;
}

int transmitPM01(unsigned char *thebuf)
{
  int PM01Val;
  PM01Val=((thebuf[3]<<8) + thebuf[4]); //count PM1.0 value of the air detector module
  return PM01Val;
}

//transmit PM Value to PC
int transmitPM2_5(unsigned char *thebuf)
{
  int PM2_5Val;
  PM2_5Val=((thebuf[5]<<8) + thebuf[6]);//count PM2.5 value of the air detector module
  return PM2_5Val;
}

//transmit PM Value to PC
int transmitPM10(unsigned char *thebuf)
{
  int PM10Val;
  PM10Val=((thebuf[7]<<8) + thebuf[8]); //count PM10 value of the air detector module
  return PM10Val;
}

Use with Arduino Software Serial

NOTE: The following codes are for using Software Serial.

/*!
 * @file  SEN0177.ino
 * @brief Abstract: Read value of PM1,PM2.5 and PM10 of air quality
 * @n The RX pin on the sensor connects to pin 11 on the Arduino
 * @n The TX pin on the sensor connects to pin 10 on the Arduino
 * @copyright  Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @license  The MIT License (MIT)
 * @author  Zuyang @ HUST
 * @version  V3.0
 * @date  2016-03-25
 */
#include <Arduino.h>
#include <SoftwareSerial.h>

#define LENG 31   //0x42 + 31 bytes equal to 32 bytes
unsigned char buf[LENG];

int PM01Value=0;          //define PM1.0 value of the air detector module
int PM2_5Value=0;         //define PM2.5 value of the air detector module
int PM10Value=0;         //define PM10 value of the air detector module

SoftwareSerial PMSerial(10, 11); // RX, TX

void setup()
{
  PMSerial.begin(9600);
  PMSerial.setTimeout(1500);
  Serial.begin(9600);
}

void loop()
{
  if(PMSerial.find(0x42)){
    delay(100);
    PMSerial.readBytes(buf,LENG);

    if(buf[0] == 0x4d){
      if(checkValue(buf,LENG)){
        PM01Value=transmitPM01(buf); //count PM1.0 value of the air detector module
        PM2_5Value=transmitPM2_5(buf);//count PM2.5 value of the air detector module
        PM10Value=transmitPM10(buf); //count PM10 value of the air detector module
      }
    }
  }

  static unsigned long OledTimer=millis();
    if (millis() - OledTimer >=1000)
    {
      OledTimer=millis();

      Serial.print("PM1.0: ");
      Serial.print(PM01Value);
      Serial.println("  ug/m3");

      Serial.print("PM2.5: ");
      Serial.print(PM2_5Value);
      Serial.println("  ug/m3");

      Serial.print("PM1 0: ");
      Serial.print(PM10Value);
      Serial.println("  ug/m3");
      Serial.println();
    }

}

char checkValue(unsigned char *thebuf, char leng)
{
  char receiveflag=0;
  int receiveSum=0;

  for(int i=0; i<(leng-2); i++){
  receiveSum=receiveSum+thebuf[i];
  }
  receiveSum=receiveSum + 0x42;

  if(receiveSum == ((thebuf[leng-2]<<8)+thebuf[leng-1]))  //check the serial data
  {
    receiveSum = 0;
    receiveflag = 1;
  }
  return receiveflag;
}

int transmitPM01(unsigned char *thebuf)
{
  int PM01Val;
  PM01Val=((thebuf[3]<<8) + thebuf[4]); //count PM1.0 value of the air detector module
  return PM01Val;
}

//transmit PM Value to PC
int transmitPM2_5(unsigned char *thebuf)
{
  int PM2_5Val;
  PM2_5Val=((thebuf[5]<<8) + thebuf[6]);//count PM2.5 value of the air detector module
  return PM2_5Val;
}

//transmit PM Value to PC
int transmitPM10(unsigned char *thebuf)
{
  int PM10Val;
  PM10Val=((thebuf[7]<<8) + thebuf[8]); //count PM10 value of the air detector module
  return PM10Val;
}

Expected Results

Please wait 30s for the data.

Communication protocol

Serial port baudrate: 9600; Parity: None; Stop Bits: 1; packet length is fixed at 32 bytes.

Dimensions

FAQ

More Documents

Datasheet