//DHT22

#include <DHT.h>; //import Libraries

#define DHTPIN 3     // what pin we're connected to

#define DHTTYPE DHT22   // DHT 22  (AM2302)

DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal 16mhz Arduino

//Varibles

int chk;

float hum;  //Stores humidity value

float temp; //Stores temperature value

//DHT22

//GP2Y1010AU0F

int measurePin = 0; //Connect dust sensor to Arduino A0 pin

int ledPower = 2;   //Connect 3 led driver pins of dust sensor to Arduino D2

int samplingTime = 280; //time require to sample signal coming out of the sensor

int deltaTime = 40;

int sleepTime = 9680;

//variable

float voMeasured = 0; //data is sensed by A0

float calcVoltage = 0;

float dustDensity = 0;

//GP2Y1010AU0F

void setup(){

  Serial.begin(9600);

  pinMode(ledPower,OUTPUT); //output pin is on D2(set up the function of pin D2)

  //DHT22

  dht.begin();

}

void loop(){

  //GP2Y1010AU0F

  //The total measurement process takes around 10ms but the sampling period is 0.28ms.

  //make the ledpin low that turns on the led and we use the delayMicroseconds() function to generate a 0.28mS delay

  //that is recommended by the datasheet. Then we take our sample and add another delay of 40uS,

  //this will ensure the pulse width remains at .32ms or 320us and we sleep for the rest of the 9680uS.

  //we calculate the voltage value from the ADC(analog to digital converter) value.

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

  delayMicroseconds(samplingTime);//delay samplingTime microsecond

  voMeasured = analogRead(measurePin); // read the dust value(A0 pin) to calculate the voltage value from the ADC(analog to digital converter) value.

  delayMicroseconds(deltaTime);//delay deltaTime microsecond

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

  delayMicroseconds(sleepTime);

  // 0 - 5V mapped to 0 - 1023 integer values

  // recover voltage

  calcVoltage = voMeasured * (5.0 / 1024.0); //turn the data sensed by A0 by the function

  // linear eqaution taken from http://www.howmuchsnow.com/arduino/airquality/

  // Chris Nafis (c) 2012

  dustDensity = 0.172* calcVoltage - 0.0999;

  //GP2Y1010AU0F

  //DHT22

  hum = dht.readHumidity();

  temp= dht.readTemperature();

  //DHT22

  Serial.print("  Voltage: ");

  Serial.print(calcVoltage);

  Serial.print("  Dust Density: ");

  Serial.print(dustDensity * 1000); // 這裡將數值呈現改成較常用的單位( ug/m3 )

  Serial.println(" ug/m3 ");

  Serial.print(" Humidity: ");

  Serial.print(hum);

  Serial.print(" %, Temp: ");

  Serial.print(temp);

  Serial.println(" Celsius");

  delay(3000);//delay

}