Example Code for Arduino Leonardo - Read Air Quality Data

Hardware Preparation

• DFRobot Leonardo & Xbee R3 Mainboard x 1
• Gravity IO Expansion Shield V7.1 x 1
• Air Quality Monitor x 1
• M-M/F-M/F-F Jumper wires

Software Preparation

• Arduino IDE Click to Download Arduino IDE from Arduino®

Other Preparation Work

This code uses Leonardo HardwareSerial1 as communication port.

Sample Code

/*!
 * @file  SEN0233.ino
 * @brief Air Quality Monitor (PM 2.5, HCHO, Temperature & Humidity)
 * @n Get the module here: https://www.dfrobot.com/product-1612.html
 * @n This example is to detect formaldehyde, PM2.5, temperature and humidity in the environment.
 * @copyright  Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @license  The MIT License (MIT)
 * @author  [lijun]([email protected])
 * @version  V1.0
 * @date  2017-04-21
 */

char col;
unsigned int PMSa1 = 0, PMSa2_5 = 0, PMSa10 = 0, FMHDSa = 0, TPSa = 0, HDSa = 0, PMSb1 = 0, PMSb2_5 = 0, PMSb10 = 0, FMHDSb = 0, TPSb = 0, HDSb = 0;
unsigned int PMS1 = 0,PMS2_5 = 0,PMS10 = 0, FMHDS = 0, TPS = 0, HDS = 0, CR1 = 0, CR2 = 0;
unsigned char bufferRTT[32] = {}; //serial receive data
char tempStr[15];

void setup()
{
  // put your setup code here, to run once:
  Serial.begin(115200);

  //Select serial port(Serial1,Serial2,Serial3)
  Serial1.begin(9600);
}

void loop()
{
  // put your main code here, to run repeatedly:
  while (!Serial1.available());
  while (Serial1.available() > 0) //Check whether there is any serial data
  {
    for (int i = 0; i < 32; i++)
    {
      col = Serial1.read();
      bufferRTT[i] = (char)col;
      delay(2);
    }

    Serial1.flush();

    CR1 = (bufferRTT[30] << 8) + bufferRTT[31];
    CR2 = 0;
    for (int i = 0; i < 30; i++)
      CR2 += bufferRTT[i];
    if (CR1 == CR2)               //Check
    {
      PMSa1 = bufferRTT[10];      //Read PM1 high 8-bit data
      PMSb1 = bufferRTT[11];      //Read PM1 low 8-bit data
      PMS1 = (PMSa1 << 8) + PMSb1;   //PM1 data

      PMSa2_5 = bufferRTT[12];      //Read PM2.5 high 8-bit data
      PMSb2_5 = bufferRTT[13];      //Read PM2.5 low 8-bit data
      PMS2_5 = (PMSa2_5 << 8) + PMSb2_5;   //PM2.5 data

      PMSa10 = bufferRTT[14];      //Read PM10 high 8-bit data
      PMSb10 = bufferRTT[15];      //Read PM10 low 8-bit data
      PMS10 = (PMSa10 << 8) + PMSb10;   //PM10 data

      TPSa = bufferRTT[24];      //Read temperature high 8-bit data
      TPSb = bufferRTT[25];      //Read temperature low 8-bit data
      TPS = (TPSa << 8) + TPSb;   //Temperature data

      HDSa = bufferRTT[26];      //Read humidity high 8-bit data
      HDSb = bufferRTT[27];      //Read humidity low 8-bit data
      HDS = (HDSa << 8) + HDSb;   //Humidity data
    }
    else
    {
      PMS1 = 0;
      PMS2_5 = 0;
      PMS10 = 0;
      TPS = 0;
      HDS = 0;
    }
  }

  Serial.println("-----------------------uart--------------------------");
  Serial.print("Temp : ");
  sprintf(tempStr, "%d%d.%d", TPS / 100, (TPS / 10) % 10, TPS % 10);
  Serial.print(tempStr);
  Serial.println(" C");              //Display temperature
  Serial.print("RH   : ");
  sprintf(tempStr, "%d%d.%d", HDS / 100, (HDS / 10) % 10, HDS % 10);
  Serial.print(tempStr);            //Display humidity
  Serial.println(" %");               //%
  Serial.print("PM1.0: ");
  Serial.print(PMS1);
  Serial.println(" ug/m3"); //Display PM1.0 unit  ug/m³ 
  Serial.print("PM2.5: ");
  Serial.print(PMS2_5);
  Serial.println(" ug/m3"); //Display PM2.5 unit  ug/m³ 
  Serial.print("PM 10: ");
  Serial.print(PMS10);
  Serial.println(" ug/m3"); //Display PM 10 unit  ug/m³ 

}

Result