Arduino - PachubeClient

/*

  Pachube sensor client



 This sketch connects an analog sensor to Pachube (http://www.pachube.com)

 using a Wiznet Ethernet shield. You can use the Arduino Ethernet shield, or

 the Adafruit Ethernet shield, either one will work, as long as it's got

 a Wiznet Ethernet module on board.



 This example has been updated to use version 2.0 of the Pachube.com API.

 To make it work, create a feed with a datastream, and give it the ID

 sensor1. Or change the code below to match your feed.





 Circuit:

 * Analog sensor attached to analog in 0

 * Ethernet shield attached to pins 10, 11, 12, 13



 created 15 March 2010

 modified 9 Apr 2012

 by Tom Igoe with input from Usman Haque and Joe Saavedra



http://arduino.cc/en/Tutorial/PachubeClient

 This code is in the public domain.



 */

#include <SPI.h>
#include <Ethernet.h>

#define APIKEY         "YOUR API KEY GOES HERE" // replace your pachube api key here
#define FEEDID         00000 // replace your feed ID
#define USERAGENT      "My Project" // user agent is the project name

// assign a MAC address for the ethernet controller.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
// fill in your address here:
byte mac[] = {

  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};

// fill in an available IP address on your network here,
// for manual configuration:

IPAddress ip(10,0,1,20);
// initialize the library instance:

EthernetClient client;

// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:

IPAddress server(216,52,233,122);      // numeric IP for api.pachube.com
//char server[] = "api.pachube.com";   // name address for pachube API

unsigned 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 unsigned long postingInterval = 10*1000; //delay between updates to Pachube.com

void setup() {

 // Open serial communications and wait for port to open:

  Serial.begin(9600);

   while (!Serial) {

    ; // wait for serial port to connect. Needed for Leonardo only

  }

 // start the Ethernet connection:

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

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

    // DHCP failed, so use a fixed IP address:

    Ethernet.begin(mac, ip);

  }
}

void loop() {

  // read the analog sensor:

  int sensorReading = analogRead(A0);

  // 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)) {

    sendData(sensorReading);

  }

  // 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(int thisData) {

  // if there's a successful connection:

  if (client.connect(server, 80)) {

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

    // send the HTTP PUT request:

    client.print("PUT /v2/feeds/");

    client.print(FEEDID);

    client.println(".csv HTTP/1.1");

    client.println("Host: api.pachube.com");

    client.print("X-PachubeApiKey: ");

    client.println(APIKEY);

    client.print("User-Agent: ");

    client.println(USERAGENT);

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

    // calculate the length of the sensor reading in bytes:

    // 8 bytes for "sensor1," + number of digits of the data:

    int thisLength = 8 + getLength(thisData);

    client.println(thisLength);

    // last pieces of the HTTP PUT request:

    client.println("Content-Type: text/csv");

    client.println("Connection: close");

    client.println();

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

    client.print("sensor1,");

    client.println(thisData);



  }

  else {

    // if you couldn't make a connection:

    Serial.println("connection failed");

    Serial.println();

    Serial.println("disconnecting.");

    client.stop();

  }

   // note the time that the connection was made or attempted:

  lastConnectionTime = millis();
}

// This method calculates the number of digits in the
// sensor reading.  Since each digit of the ASCII decimal
// representation is a byte, the number of digits equals
// the number of bytes:

int getLength(int someValue) {

  // there's at least one byte:

  int digits = 1;

  // continually divide the value by ten,

  // adding one to the digit count for each

  // time you divide, until you're at 0:

  int dividend = someValue /10;

  while (dividend > 0) {

    dividend = dividend /10;

    digits++;

  }

  // return the number of digits:

  return digits;
}