自制PM2.5检测仪

电源

先晒一张完成品的图：

PM2.5监测仪的核心传感器就是 Dust Sensor，它能够检测大于0.8um的灰尘颗粒浓度，使用也比较方便，只需要四个引脚。

准备材料：

UNO PLUS
I/O Expansion Shield
1.3inch OLED
温湿度传感器
PM2.5传感器

硬件连接：
1. UNO PLUS的电源用跳线帽配置为5V，I/O Expansion Shield的电压同样用跳线帽配置为5V
2. 连接PM2.5传感器

VCC -- VCC

GND -- GND

AOUT -- A5

ILED -- D3

3. 连接OLED

VCC -- VCC

GND -- GND

DIN -- D11

CLK -- D13

CS -- D10

D/C -- D9

RES -- D8

4. 连接温湿度传感器

VCC -- VCC

GND -- GND

DOUT -- D2

示例程序：

#include "U8glib.h"
#include "dht11.h"
#define COV_RAtiO 0.2 //ug/mmm / mv
#define NO_DUST_VOLTAGE 450 //mv
#define SYS_VOLTAGE 5000
const int iled = 3; //drive the led of sensor
const int vout = 5; //analog input
const int DHT11PIN = 2;
U8GLIB_SH1106_128X64 u8g(13, 11, 10, 9, 8); // SW SPI Com: SCK = 13, MOSI = 11, CS = 10, A0 = 9,RST = 8
dht11 DHT11;
int chk;
String di***uff;
float density, voltage;
int adcvalue;
int Filter(int m)
{
static int flag_first = 0, _buff[10], sum;
const int _buff_max = 10;
int i;
if(flag_first == 0)
{
flag_first = 1;
for(i = 0, sum = 0; i < _buff_max; i++)
{
_buff = m;
sum += _buff;
}
return m;
}
else
{
sum -= _buff[0];
for(i = 0; i < (_buff_max - 1); i++)
{
_buff = _buff[i + 1];
}
_buff[9] = m;
sum += _buff[9];
i = sum / 10.0;
return i;
}
}
void setup(void)
{
u8g.setFont(u8g_font_6x13);
u8g.setFontPosTop();
pinMode(iled, OUTPUT);
digitalWrite(iled, LOW); //iled default closed
}
void loop(void)
{
/*
get humidity and temperature
*/
chk = DHT11.read(DHT11PIN);
/*
get density
*/
digitalWrite(iled, HIGH);
delayMicroseconds(280);
adcvalue = analogRead(vout);
digitalWrite(iled, LOW);
adcvalue = Filter(adcvalue);
voltage = (SYS_VOLTAGE / 1024.0) * adcvalue * 11;
if(voltage >= NO_DUST_VOLTAGE)
{
voltage -= NO_DUST_VOLTAGE;
density = voltage * COV_RATIO;
}
else
density = 0;
/*
display result
*/
u8g.firstPage();
do
{
di***uff = " H = ";
di***uff.concat((float)DHT11.humidity);
di***uff += "%RH";
u8g.drawStr( 0, 6, di***uff.c_str());
di***uff = " T = ";
di***uff.concat((float)DHT11.temperature);
di***uff += "C";
u8g.drawStr( 0, 26, di***uff.c_str());
di***uff = " PM2.5 = ";
di***uff.concat(density);
di***uff += "ug/m3";
u8g.drawStr(0, 46, di***uff.c_str());
} while( u8g.nextPage() );
delay(500);
}

[color=rgb(88, 170, 165) !important]复制代码

leoyang · 2017-8-1 17:54:42

这个可以有

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自制PM2.5检测仪

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