/*Puedes enocntrar todo el proyecto en:

http://www.howmuchsnow.com/arduino/airquality/



*/



/*

 Interface to Sharp GP2Y1010AU0F Particle Sensor

 Program by Christopher Nafis 

 Written April 2012

 

 http://www.sparkfun.com/datasheets/Sensors/gp2y1010au_e.pdf

 http://sensorapp.net/?p=479

 

 Sharp pin 1 (V-LED)   => 5V (connected to 150ohm resister)

 Sharp pin 2 (LED-GND) => Arduino GND pin

 Sharp pin 3 (LED)     => Arduino pin 2

 Sharp pin 4 (S-GND)   => Arduino GND pin

 Sharp pin 5 (Vo)      => Arduino A0 pin

 Sharp pin 6 (Vcc)     => 5V

 */

#include <SPI.h>

#include <Ethernet.h>

#include <stdlib.h>



byte mac[] = { 

  0x90, 0xA2, 0xDA, 0x0D, 0x27, 0x55};

IPAddress ip(192,168,1,90);

IPAddress gateway(192,168,1,1);	

IPAddress subnet(255, 255, 255, 0);



// initialize the library instance:

EthernetClient client;



long lastConnectionTime = 0;        // last time you connected to the server, in milliseconds

boolean lastConnected = false;      // state of the connection last time through the main loop

const int postingInterval = 10000;  //delay between updates to Pachube.com



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);

  // start the Ethernet connection:

  if (Ethernet.begin(mac) == 0) {

    Serial.println("Failed to configure Ethernet using DHCP");

    // Configure manually:

    Ethernet.begin(mac, ip);

  }

  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);





  // if there's incoming data from the net connection.

  // send it out the serial port.  This is for debugging

  // purposes only:

  if (client.available()) {

    char c = client.read();

    //Serial.print(c);

  }



  // if there's no net connection, but there was one last time

  // through the loop, then stop the client:

  if (!client.connected() && lastConnected) {

    Serial.println();

    Serial.println("disconnecting.");

    client.stop();

  }



  // if you're not connected, and ten seconds have passed since

  // your last connection, then connect again and send data:

  if(!client.connected() && (millis() - lastConnectionTime > postingInterval)) {

    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);

    sendData(dataString);

    Serial.println(dataString);

    delay(1000);

  }

  // store the state of the connection for next time through

  // the loop:

  lastConnected = client.connected();

}



// this method makes a HTTP connection to the server:

void sendData(String thisData) {

  // if there's a successful connection:

  if (client.connect("www.pachube.com", 80)) {

    Serial.println("connecting...");

    // send the HTTP PUT request. 

    // fill in your feed address here:

    client.print("PUT /api/YOUR_FEED_HERE.csv HTTP/1.1\n");

    client.print("Host: www.pachube.com\n");

    // fill in your Pachube API key here:

    client.print("X-PachubeApiKey: YOUR_KEY_HERE\n");

    client.print("Content-Length: ");

    client.println(thisData.length(), DEC);



    // last pieces of the HTTP PUT request:

    client.print("Content-Type: text/csv\n");

    client.println("Connection: close\n");



    // here's the actual content of the PUT request:

    client.println(thisData);



    // note the time that the connection was made:

    lastConnectionTime = millis();



  } 

  else {

    // if you couldn't make a connection:

    Serial.println("connection failed");

  }

}