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OLED_PM25.ino
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OLED_PM25.ino
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#include <SoftwareSerial.h>
#include "U8glib.h"
#include <dht11.h>
#define DHT11PIN 9
dht11 DHT11;
U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE);
SoftwareSerial mySerial(8,7);
int oldVal=0;
int cnt=0;
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(2400);
mySerial.begin(2400);
pinMode(10,OUTPUT);
pinMode(11,OUTPUT);
delay(200);
}
void loop() {
// put your main code here, to run repeatedly:
char str1[32];
char str2[32];
float val_pm25;
int chk;
cnt++;
if(cnt==20)
cnt=0;
if(cnt<=10)
{
val_pm25 = calcPM25();//夏普PM2.5传感器
//Serial.println(val_pm25);
if(val_pm25>0)
oldVal=(int)val_pm25;
if(oldVal>999)
oldVal=999;
sprintf(str1,"PM2.5:%03d",oldVal);
//////////////////////////////////////
if(oldVal<150)//空气良好:绿色
{
digitalWrite(10,1);
digitalWrite(11,0);
}else if(oldVal<300)//空气一般:黄色
{
analogWrite(10,200);
analogWrite(11,50);
}else{//空气差:红色
digitalWrite(10,0);
digitalWrite(11,1);
}
//////////////////////////////////////
u8g.firstPage();
do {
draw();
u8g.setFont(u8g_font_fub17);
u8g.drawStr(6, 58,str1);
//u8g.drawStr(0, 40,str1);
} while( u8g.nextPage() );
}else{
chk = DHT11.read(DHT11PIN);
delay(200);
if(chk==DHTLIB_OK)
{
sprintf(str1,"Humi:%d (%%) ",(int)DHT11.humidity);
sprintf(str2,"Temp:%d (oC) ",(int)DHT11.temperature);
u8g.firstPage();
do {
draw();
u8g.drawStr(0, 56,str1);
u8g.drawStr(0, 36,str2);
} while( u8g.nextPage() );
}
}
delay(500);
}
float calcPM25()//计算均值,采集5个点,去掉最大最小值,然后求平均数
{
float val[5],vpm;
float vmax,vmin,vsum;
int i,j;
vsum = 0.0;
for(i=0;i<5;i++)
{
j=0;
while(1)
{
vpm = GetPM25Data_sharp();
if(vpm>1.0)
break;
j++;
if(j==5)
return 0.0;
}
val[i] = vpm;
vsum+=vpm;
}
vmax = val[0];
vmin = val[0];
for(i=0;i<4;i++)
{
if(vmax<val[i+1])
vmax = val[i+1];
if(vmin>val[i+1])
vmin = val[i+1];
}
vsum-=vmax;
vsum-=vmin;
return vsum/3.0;
}
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)
//while(Serial.available()>0)
{
gdata = mySerial.read();//保存接收字符
//gdata = Serial.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;
}