if(mCheck == mPkt*256+mPkt)//crc ok
你这个校验不对吧？
#include <Arduino.h>
#define LENG 32
char buf;
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);
}
void loop()
{
if(Serial.available())
{
Serial.readBytes(buf,LENG);
if(buf == 0x42 && buf == 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: ");//send PM1.0 data to bluetooth
Serial.print(PM01Value);
Serial.println("ug/m3");
Serial.print("PM2.5: ");//send PM1.0 data to bluetooth
Serial.print(PM2_5Value);
Serial.println("ug/m3");
Serial.print("PM10:");//send PM1.0 data to bluetooth
Serial.print(PM10Value);
Serial.println("ug/m3");
}
}
char checkValue(char *thebuf, char leng)
{
char receiveflag=0;
int receiveSum=0;
char i=0;
for(i=0;i<leng;i++)
{
receiveSum=receiveSum+thebuf;
}
if(receiveSum==((thebuf<<8)+thebuf+thebuf+thebuf))//check the serial data
{
receiveSum=0;
receiveflag=1;
}
return receiveflag;
}
int transmitPM01(char *thebuf)
{
int PM01Val;
PM01Val=((thebuf<<8) + thebuf); //count PM1.0 value of the air detector module
return PM01Val;
}
//transmit PM Value to PC
int transmitPM2_5(char *thebuf)
{
int PM2_5Val;
PM2_5Val=((thebuf<<8) + thebuf);//count PM2.5 value of the air detector module
return PM2_5Val;
}
//transmit PM Value to PC
int transmitPM10(char *thebuf)
{
int PM10Val;
PM10Val=((thebuf<<8) + thebuf); //count PM10 value of the air detector module
return PM10Val;
}
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