***************************

センサ–>Arduinoの接続：

1.Vled–>150Ω抵抗–>5V

↓

電解コンデンサ–>GND

2.LED-GND–>GND

3.LED–>デジタルpin 2

4.S-GND–>GND

5.Vo–> アナログpin 0

6.Vcc –>5V

***************************

#include <SPI.h>

#include <stdlib.h>

int dustPin=0;

int ledPower=2;

int delayTime=280;

int delayTime2=40;

float offTime=9680;

int dustVal=0;

int i=0;

float ppm=0;

char s[32];

float voltage = 0;

float dustdensity = 0;

float ppmpercf = 0;

void setup(){

Serial.begin(9600);

pinMode(ledPower,OUTPUT);

// give the ethernet module time to boot up:

delay(1000);

i=0;

ppm =0;

}

void loop(){

i=i+1;

digitalWrite(ledPower,LOW); // power on the LED

delayMicroseconds(delayTime);

dustVal=analogRead(dustPin); // read the dust value

ppm = ppm+dustVal;

delayMicroseconds(delayTime2);

digitalWrite(ledPower,HIGH); // turn the LED off

delayMicroseconds(offTime);

voltage = ppm/i*0.0049;

dustdensity = 0.17*voltage-0.1;

ppmpercf = (voltage-0.0256)*120000;

if (ppmpercf < 0)

ppmpercf = 0;

if (dustdensity < 0 )

dustdensity = 0;

if (dustdensity > 0.5)

dustdensity = 0.5;

String dataString = "";

dataString += dtostrf(voltage, 9, 4, s);

dataString += ",";

dataString += dtostrf(dustdensity, 5, 2, s);

dataString += ",";

dataString += dtostrf(ppmpercf, 8, 0, s);

i=0;

ppm=0;

Serial.println(dataString);

delay(1000);

}