论坛 › Arduino › PM检测

seacowtech 发表于 2016-12-21 22:45:59

PM检测

最近都是大神各种发帖，搞得我这种小白都不好意思了，发个low点的，也希望大神指点指点。:lol:lol:lol


设计目标：检测PM2.5，并将数据结果打印到LCD12864屏幕和PC串口上。同时当PM2.5大于40ug/m3时开始闪烁LED灯珠报警。

设备清单：

[*]Arduino Mega 2560 控制点此购买
[*]Mega sensor shield v2.4 点此购买
[*]LCD12864 Shield V1.0 点此购买
[*]Digital Plranha Green Led Module V2
[*]PM2.5激光粉尘传感器 点此购买

接线说明：
PM2.5传感器，Arduino的TX/RX接传感器的RX/TX（注意TX和RX要交叉接线，TX–RX，RX–TX），LED接到数字口20上。

完整代码
#include <U8glib.h>
#include <Arduino.h>

#define LENG 31   //0x42 + 31 bytes equal to 32 bytes
unsigned char buf;

//创建lcd对象
U8GLIB_NHD_C12864 u8g(13, 11, 10, 9, 8);

//声明LED灯珠使用的是数字口20
int led = 20;

//初始化变量，用于存储PM1.0， PM2.0， PM10的读书
int PM0_1Value=0;
int PM2_5Value=0;
int PM10Value=0;

//检查送串口获取到的读书
char checkValue(unsigned char *thebuf, char leng)
{
char receiveflag=0;
int receiveSum=0;

for(int i=0; i<(leng-2); i++){
receiveSum=receiveSum+thebuf;
}
receiveSum=receiveSum + 0x42;

if(receiveSum == ((thebuf<<8)+thebuf))//check the serial data
{
receiveSum = 0;
receiveflag = 1;
}
return receiveflag;
}


int transmitPM0_1(unsigned char *thebuf)
{
int PM0_1Val;
PM0_1Val=((thebuf<<8) + thebuf); //count PM1.0 value of the air detector module
return PM0_1Val;
}

int transmitPM2_5(unsigned char *thebuf)
{
int PM2_5Val;
PM2_5Val=((thebuf<<8) + thebuf);//count PM2.5 value of the air detector module
return PM2_5Val;
}

int transmitPM10(unsigned char *thebuf)
{
int PM10Val;
PM10Val=((thebuf<<8) + thebuf); //count PM10 value of the air detector module
return PM10Val;
}

void drawTitle(){
u8g.setFont(u8g_font_unifont);
u8g.drawStr(0, 18, "PM1.0: ");
u8g.drawStr(0, 36, "PM2.5: ");
u8g.drawStr(0, 54, "PM1 0: ");
u8g.drawStr(80, 18, "ug/m3");
u8g.drawStr(80, 36, "ug/m3");
u8g.drawStr(80, 54, "ug/m3");
}

void lightAlarm(){
digitalWrite(led, HIGH);   //Turn on led
delay(100);
digitalWrite(led, LOW);    //Turn off led
delay(100);
}

void drawData(){
u8g.setFont(u8g_font_unifont);
u8g.setPrintPos(45,18);
u8g.print(PM0_1Value);
u8g.setPrintPos(45,36);
u8g.print(PM2_5Value);
u8g.setPrintPos(45,54);
u8g.print(PM10Value);
}

void drawScreen(){
drawTitle();
drawData();
}

void setup() {
// put your setup code here, to run once:
u8g.setRot180();// rotate screen
Serial.begin(9600);
pinMode(led, OUTPUT);   //Set Pin20 as output
}

void loop() {
// put your main code here, to run repeatedly:
if(Serial.find(0x42)){    //检测到0x42时，开始读取
    Serial.readBytes(buf,LENG);

    if(buf == 0x4d){
      if(checkValue(buf,LENG)){
      PM0_1Value=transmitPM0_1(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(PM0_1Value);
    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();
}

u8g.firstPage();
drawScreen();
do {
    drawScreen();
} while( u8g.nextPage() );
delay(500);

if(PM2_5Value>40){
    lightAlarm();
}
delay(500);
}

dsweiliang 发表于 2016-12-22 04:04:50

感谢分享，学习了

hnyzcj 发表于 2016-12-22 09:40:30

顶起来

luna 发表于 2016-12-22 17:47:44

代码写的好工整~

seacowtech 发表于 2016-12-24 00:36:08

luna 发表于 2016-12-22 17:47
代码写的好工整~

嘿嘿，说的我都不好意思了

seacowtech 发表于 2016-12-24 00:36:48

dsweiliang 发表于 2016-12-22 04:04
感谢分享，学习了

一起学咯，这里好多好多可以学的。

gray6666 发表于 2016-12-24 20:28:24

实用，好课题

20060606 发表于 2020-8-15 05:35:09

好高端!!!!!

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