Gravity: Laser PM2.5 Air Quality Sensor for Arduino (แท้จาก DFRobot)

//******************************
//*Abstract: Read value of PM1,PM2.5 and PM10 of air quality
//
//*Version：V3.1
//*Author：Zuyang @ HUST
//*Modified by Cain for Arduino Hardware Serial port compatibility
//*Date：March.25.2016
//******************************
#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
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;
}

//******************************
//*Abstract: Read value of PM1,PM2.5 and PM10 of air quality
//*Product Link: https://www.dfrobot.com.cn/goods-1113.html
//*
//8
//*The RX pin on the sensor connects to pin 11 on the Arduino
//*The TX pin on the sensor connects to pin 10 on the Arduino
//
//*Version：V3.1
//*Author：Zuyang @ HUST
//*Date：March.25.2016
//******************************
#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)){
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;
}