Arduino - Internet of Things (continued #2)

/*

  Sparkfun Date Web client

This sketch connects to the Sparkfun Data feed (http://data.sparkfun.com).

It uses the Arduino Wiznet Ethernet shield.

Senses temperature using DS18B20 and pushes this data to Sparkfun Data feed.

Circuit:

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

* DS18B20 attached to pin 2

created 30 May 2014 by @languer

*/

 

#include <SPI.h>

#include <Ethernet.h>

#include <OneWire.h>

 

// Enter a MAC address for your controller below.

byte mac = {0xDE, 0xAD, 0xBE, 0xEF, 0xFF, 0x01};

char server = "data.sparkfun.com";

char publicKey = "/input/Jxyjr7DmxwTD5dG1D1Kv";

char privateKey = "?private_key=gzgnB4VazkIg7GN1g1qA";

 

// Initialize the Ethernet client library

EthernetClient client;

 

// DS18B20 pin

OneWire  ds(2);  // on pin 2 (a 4.7K resistor is necessary)

 

 

void setup()

{

  Serial.begin(9600);

  delay(2500);

  Serial.println("Sparkfun Web Client");

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

  Ethernet.begin(mac);

  sendFirstMessage();

}

 

void loop()

{

  // if connection was successful, send data to display

  if (client.connect(server, 80))

  {

    String var = "";

    var = var + readDS18B20();

    Serial.println("sending data...");

    client.print("GET ");

    client.print(publicKey);

    client.print(privateKey);

    client.println(var);

    client.println("Host: data.sparkfun.com");

    client.println("Connection: close");

    client.println();

    Serial.println("data sent...");

  }

  // read available server data

  delay(15000); // give server 15secs to respond

  if (client.available())

  {

    Serial.println("reading data...");

    do

    {

      char c = client.read();

      Serial.print(c);

    } while (client.available());

    Serial.println("data read...");

  }

  // if the server's disconnected, stop the client:

  if (!client.connected())

  {

    Serial.println();

    Serial.println("disconnecting.");

    client.stop();

    // do nothing forevermore - remove to continuously send data

    //while(true);

  }

  // repeat every 15secs

  delay(15000);

}

 

void sendFirstMessage()

{

  String s = "&brewTemp=Live%20From%20Arduino";

  if (client.connect(server, 80))

  {

    Serial.println("sending data...");

    client.print("GET ");

    client.print(publicKey);

    client.print(privateKey);

    client.println(s);

    client.println("Host: data.sparkfun.com");

    client.println("Connection: close");

    client.println();

    Serial.println("data sent...");

    Serial.println("disconnecting.");

    client.stop();

  }

  // read available server data

  delay(15000); // give server 15secs to respond

  if (client.available())

  {

    Serial.println("reading data...");

    do

    {

      char c = client.read();

    } while (client.available());

  }

  if (!client.connected())

  {

    Serial.println("disconnecting.");

    client.stop();

  }

}

 

String readDS18B20()

{

  byte i;

  byte data;

  String var;

 

  // conversion routine

  ds.reset();

  ds.skip();

  ds.write(0x44, 1);  // start conversion, with parasite power on at the end

 

  delay(1000);        // delay to allow for conversion

 

  // read temperature

  ds.reset();

  ds.skip();

  ds.write(0xBE);           // Read Scratchpad

  for ( i = 0; i < 9; i++)  // temperature data consists of 9 bytes

  {

    data = ds.read();

  }

 

  // Convert the data to actual temperature

  // because the result is a 16 bit signed integer, it should

  // be stored to an "int16_t" type, which is always 16 bits

  // even when compiled on a 32 bit processor.

  int16_t raw = (data << 8) | data;

  byte cfg = (data & 0x60);

  // at lower res, the low bits are undefined, so let's zero them

  if (cfg == 0x00) raw = raw & ~7;  // 9 bit resolution, 93.75 ms

  else if (cfg == 0x20) raw = raw & ~3; // 10 bit res, 187.5 ms

  else if (cfg == 0x40) raw = raw & ~1; // 11 bit res, 375 ms

  //// default is 12 bit resolution, 750 ms conversion time

  long c_2dec, f_2dec;

  // calculate celsius to 2 decimal places

  c_2dec = raw;

  c_2dec = (c_2dec * 100) / 16;

  // calculate farenheit to 2 decimal places

  f_2dec = ((c_2dec * 9) / 5) + 3200;

  String c_temp, f_temp;

  c_temp = long2String(c_2dec);

  f_temp = long2String(f_2dec);

  var = "&brewTemp=";

  var = var + c_temp + "degC,%20";

  var = var + f_temp + "degF";

  return var;

}

 

String long2String(long d)

{

  String s;

  long d1, d2;

  d1 = d / 100;

  s = String(d1) + ".";

  d2 = d % 100;

  if (d2 < 10)

  {

    s = s + "0" + String(d2);

  }

  else

  {

    s = s + String(d2);

  }

  return s;

}