Gravity: PM2.5激光粉尘环境质量传感器 V2
我得到的数据一直是零有人知道是怎么改吗
#include <Arduino.h>#define LENG 31 //0x42 + 31 bytes equal to 32 bytesunsigned char buf[LENG;int PM01Value=0; //define PM1.0 value of the air detector moduleint PM2_5Value=0; //define PM2.5 value of the air detector moduleint PM10Value=0; //define PM10 value of the air detector modulevoid setup(){Serial.begin(9600); //use serial0Serial.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 modulereturn PM01Val;}//transmit PM Value to PCint transmitPM2_5(unsigned char *thebuf){int PM2_5Val;PM2_5Val=((thebuf[5<<8) + thebuf[6);//count PM2.5 value of the air detector modulereturn PM2_5Val;}//transmit PM Value to PCint transmitPM10(unsigned char *thebuf){int PM10Val;PM10Val=((thebuf[7<<8) + thebuf[8); //count PM10 value of the air detector modulereturn PM10Val;}
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