PM25OLED

#include <SoftwareSerial.h>
#include "U8glib.h"
U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE); 
SoftwareSerial mySerial(7,10);
const   uint8_t bitmap_s []   U8G_PROGMEM  ={0x00,0x00,0x00,0x00,0xFD,0xFC,0x04,0x84,0x44,0x84,0x44,0x84,0x28,0x88,0x28,0x88,
0x10,0x50,0x10,0x50,0x28,0x20,0x28,0x20,0x44,0x50,0x44,0x88,0x81,0x04,0x02,0x02};/*"双",0*/

const   uint8_t bitmap_y []   U8G_PROGMEM  ={0x00,0x00,0x27,0xFE,0x14,0x20,0x14,0x40,0x85,0xFC,0x45,0x04,0x45,0xFC,0x15,0x04,
0x15,0xFC,0x25,0x24,0xE4,0x20,0x24,0xA8,0x29,0x24,0x2A,0x22,0x30,0xA0,0x00,0x40};/*"源",1*/

const   uint8_t bitmap_d []   U8G_PROGMEM  ={0x01,0x00,0x01,0x00,0x01,0x00,0x3F,0xF8,0x21,0x08,0x21,0x08,0x21,0x08,0x3F,0xF8,
0x21,0x08,0x21,0x08,0x21,0x08,0x3F,0xF8,0x21,0x0A,0x01,0x02,0x01,0x02,0x00,0xFE};/*"电",2*/

const   uint8_t bitmap_z[]    U8G_PROGMEM  ={0x00,0x00,0x7F,0xF8,0x00,0x10,0x00,0x20,0x00,0x40,0x01,0x80,0x01,0x00,0xFF,0xFE,
0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x05,0x00,0x02,0x00};/*"子",3*/
void draw(void) {
  u8g.setFont(u8g_font_unifont);
  // graphic commands to redraw the complete screen should be placed here  
 u8g.drawBitmapP ( 32 , 0 , 2 , 16 , bitmap_s); 
 u8g.drawBitmapP ( 49 , 0 , 2 , 16 , bitmap_y );
 u8g.drawBitmapP ( 66 , 0 , 2 , 16 , bitmap_d); 
 u8g.drawBitmapP ( 83 , 0 , 2 , 16 , bitmap_z );
}
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  mySerial.begin(2400);
  delay(200);
}

void loop() {
  // put your main code here, to run repeatedly:
  char str1[32];
  float val_pm25 = GetPM25Data_sharp();//夏普PM2.5传感器
  Serial.println(val_pm25);
  if(val_pm25>1.0)
  {
    sprintf(str1,"PM2.5: %d     ",(int)val_pm25);   
   u8g.firstPage();  
  do {       
      draw();      
      u8g.drawStr(0, 40,str1);      
  } while( u8g.nextPage() );
   }
  delay(500);

}
float GetPM25Data_sharp()//读取PM2.5传感器,波特率：2400； 校验位：无； 停止位：1 位； 数据位：8；数据包长度为7字节
{
  int cnt,pmval,readcmd[7];
  unsigned char gdata,eFlag,rbytes=0;
  float pm25;
  cnt=0;
   eFlag =0;
  while(mySerial.available()>0)
  {
    gdata = mySerial.read();//保存接收字符 
    if(gdata==0xAA&&eFlag==0)
     {
        eFlag=1;        
    }
    if(eFlag==1)
    {
        readcmd[rbytes++]=gdata;
    }    
    delay(2);
    cnt++;
    if(cnt>100)
    return 0;
    if(rbytes==7)//完整帧
    {
      break;
      }   
    }
    if(rbytes==0)
     return 0;
    //if(readcmd[6]!=0xFF)
    // return 0;
  pmval = readcmd[1];
  pmval<<=8;
  pmval+=readcmd[2];
  pm25 = pmval*5.0/1024.0;//计算PM2.5值
  pm25*=800.0;
  if(pm25>999)
  pm25=0;
  return pm25;
}