Hi Everyone.

I am using

SKU:SEN0233 connected with DFDuino Uno

connected as follows.

I am also using the default sample code below.

/*!
* @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](ju.li@dfrobot.com)
* @version V1.0
* @date 2017-03-01
*/

#include <SoftwareSerial.h>

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];

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

void setup()
{
Serial.begin(115200);
mySerial.begin(9600);
}

void loop()
{

while (!mySerial.available());
while (mySerial.available() > 0) //Check whether there is any serial data
{
for (int i = 0; i < 32; i++)
{
col = mySerial.read();
bufferRTT[i] = (char)col;
delay(2);
}

mySerial.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
}

I am getting a serial response from Arduino serial monitoring but the values are too small to be accurate.

09:39:30.823 -> -----------------------uart--------------------------

09:39:30.823 -> Temp : 21.6 C

09:39:30.823 -> RH : 52.3 %

09:39:30.865 -> PM1.0: 1 ug/m3

09:39:30.865 -> PM2.5: 1 ug/m3

09:39:30.865 -> PM 10: 1 ug/m3

09:39:31.740 -> -----------------------uart--------------------------

09:39:31.740 -> Temp : 21.6 C

09:39:31.740 -> RH : 52.3 %

09:39:31.740 -> PM1.0: 4 ug/m3

09:39:31.740 -> PM2.5: 4 ug/m3

09:39:31.786 -> PM 10: 4 ug/m3

did anybody experience this before? the product is also new for both the controller and the sensor.
Thank you