pm2.5传感器51单片机代码

以下是一个使用51单片机的PM2.5传感器代码示例，仅供参考：

#include <reg52.h>

unsigned int PM25_Value;

sbit LED = P1^0;

sbit RST = P2^1; //PM2.5传感器复位引脚
sbit RS485_1 = P2^2; //RS485通讯引脚1
sbit RS485_2 = P2^3; //RS485通讯引脚2

void Delay1ms(unsigned int i) //延时函数
{
    unsigned int j;
    while(i--)
    {
        for (j=0; j<120; j++);
    }
}

void Init_PMS5003(void) //初始化函数
{
    RST = 0;
    Delay1ms(1000);
    RST = 1;
    Delay1ms(1000);
    RS485_1 = 0;
    RS485_2 = 1;
}

void Read_PMS5003(void) //读取函数
{
    unsigned char PM25_H, PM25_L, Check_H, Check_L, Check_Sum;
    unsigned char Data_H, Data_L;
    unsigned int i;
    unsigned char PM25_Data[32];
    RS485_1 = 1;
    RS485_2 = 0;
    Delay1ms(10);
    for (i=0; i<32; i++)
    {
        while(!SBUF);
        PM25_Data[i] = SBUF;
        SBUF = 0;
    }
    RS485_1 = 0;
    RS485_2 = 1;
    PM25_H = PM25_Data[10];
    PM25_L = PM25_Data[11];
    Check_H = PM25_Data[30];
    Check_L = PM25_Data[31];
    Check_Sum = PM25_Data[30] + PM25_Data[31];
    for (i=0; i<28; i+=2)
    {
        Data_H = PM25_Data[i];
        Data_L = PM25_Data[i+1];
        Check_Sum += Data_H + Data_L;
    }
    if (Check_Sum == ((Check_H<<8)+Check_L))
    {
        PM25_Value = PM25_H<<8 | PM25_L;
        LED = 0;
    }
    else
    {
        PM25_Value = 0;
        LED = 1;
    }
}

void main(void)
{
    TMOD = 0x20;
    TH1 = 0xFD;
    TL1 = 0xFD;
    TR1 = 1;
    SCON = 0x50;
    PCON = 0x00;
    Init_PMS5003();
    while(1)
    {
        Read_PMS5003();
        Delay1ms(2000);
    }
}

需要注意的是，该代码仅供参考，具体实现需要根据具体的传感器型号和通讯协议进行调整。同时，该代码使用的是8051单片机，如果你使用的是其他型号的单片机，也需要进行相应的修改。