#include <SPI.h>
#include <Ethernet.h>
#include <SHT1x.h>

#define dataPin  2
#define clockPin 3
SHT1x sht1x(dataPin, clockPin);

byte mac[] = {
  0x90, 0xA2, 0xD2, 0x00, 0x17, 0xAA};
byte ip[] = {
  192,168,1,20};
byte gateway[] = {
  192,168,1,254};	
byte subnet[] = {
  255,255,255,0};
byte server[] = {
  173,203,98,29};

Client client(server, 80);

long lastConnectionTime = 0;
boolean lastConnected = false;
const int postingInterval = 10000;

void setup()
{
  Ethernet.begin(mac, ip, gateway, subnet);
  Serial.begin(9600);
  delay(1000);
  Serial.println("Starting up");
}

void loop()
{
  float temp_c;
  float temp_f;
  float humidity;

  temp_c = sht1x.readTemperatureC();
  temp_f = sht1x.readTemperatureF();
  humidity = sht1x.readHumidity();

  /*
  Serial.print("Temperature: ");
   Serial.print(temp_c, DEC);
   Serial.print("C / ");
   Serial.print(temp_f, DEC);
   Serial.print("F. Humidity: ");
   Serial.print(humidity);
   Serial.println("%");
   delay(2000);
   */

  char centigrados[20]="";
  ftoa(centigrados,temp_c,3);
  char faren[20]="";
  ftoa(faren,temp_f,3);
  char humedad[20]="";
  ftoa(humedad,humidity,3);

  String dataString = String(centigrados);
  dataString += ",";
  dataString += String(faren);
  dataString += ",";
  dataString += String(humedad);

  if (client.available()) {
    char c = client.read();
    //   Serial.print(c);
  }
  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(dataString);
  }
  // store the state of the connection for next time through
  // the loop:
  lastConnected = client.connected();
}

void sendData(String thisData) {
  // if there's a successful connection:
  if (client.connect()) {
    Serial.println("connecting...");
    // send the HTTP PUT request. 
    // fill in your feed address here:
    client.print("PUT /api/13310.csv HTTP/1.1\n");
    client.print("Host: www.pachube.com\n");
    // fill in your Pachube API key here:
    client.print("X-PachubeApiKey: ____________________________________________________________ \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);
    Serial.println(thisData);

    // note the time that the connection was made:
    lastConnectionTime = millis();
  } 
  else {
    // if you couldn't make a connection:
    Serial.println("connection failed");
  }
}
// Float support is hard on arduinos
// (http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1164927646)
char *ftoa(char *a, double f, int precision)
{
  long p[] = {
    0,10,100,1000,10000,100000,1000000,10000000,100000000                    };

  char *ret = a;
  long heiltal = (long)f;
  itoa(heiltal, a, 10);
  while (*a != '\0') a++;
  *a++ = '.';
  long desimal = abs((long)((f - heiltal) * p[precision]));
  itoa(desimal, a, 10);
  return ret;
}