Arduino + WizNet Ethernet + Xively

WizNETIoT.ino

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

#include <Wire.h>           // I2C needed for sensors
#include "MPL3115A2.h"      // Pressure sensor
#include "HTU21D.h"         // Humidity sensor

// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:

byte mac[] = { "Your MAC" };
IPAddress server(216,52,233,120);
IPAddress ip( "Your IP" );

EthernetClient client;

MPL3115A2 myPressure; //Create an instance of the pressure sensor
HTU21D myHumidity; //Create an instance of the humidity sensor

const byte STAT1 = 7;
const byte STAT2 = 8;

const byte LIGHT = A1;
const byte REFERENCE_3V3 = A3;


float humidity = 0; // [%]
float tempf = 0; // [temperature F]
float pressure = 0;
float light_lvl = 455; //[analog value from 0 to 1023]

#define WEBSITE     "api.xively.com"
#define API_key     "Your APIKey"
#define feedID      "Your FeedID"


//Returns the voltage of the light sensor based on the 3.3V rail
//This allows us to ignore what VCC might be (an Arduino plugged into USB has VCC of 4.5 to 5.2V)
float get_light_level()
{
  float operatingVoltage = analogRead(REFERENCE_3V3);

  float lightSensor = analogRead(LIGHT);
  
  operatingVoltage = 3.3 / operatingVoltage; //The reference voltage is 3.3V
  
  lightSensor = operatingVoltage * lightSensor;
  
  return(lightSensor);
}

//Calculates each of the variables that wunderground is expecting
void calcWeather()
{


  //Calc humidity
  humidity = myHumidity.readHumidity();
  //float temp_h = myHumidity.readTemperature();
  //Serial.print(" TempH:");
  //Serial.print(temp_h, 2);

  //Calc tempf from pressure sensor
  tempf = myPressure.readTempF();
  tempf = (tempf - 32.0)/1.8000;
  //Serial.print(" TempP:");
  //Serial.print(tempf, 2);
  tempf = 0;
  humidity = 0;
  

  //Calc pressure
  //pressure = (myPressure.readPressure())/100000;

  //Calc light level
  light_lvl = get_light_level() * 100;

}

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() {
  
  
  calcWeather();
  
  digitalWrite(STAT1, HIGH); //Blink stat LED
  
  // Prepare JSON for Xively & get length
  int length = 0;
  String data = "";
 
  data = data + "\n" + "{\"version\":\"1.0.0\",\"datastreams\" : [ {\"id\" : \"Humidity\",\"current_value\" : \"" + String(humidity) + "\"},"
            + "{\"id\" : \"Luminosity\",\"current_value\" : \"" + String(light_lvl) + "\"}]}";
  
  length = data.length();

  digitalWrite(STAT1, HIGH); //Blink stat LED
  if (client.connect(server, 80)) {

        Serial.println("Client Connected");
        if (client.connected()) 
        {
               Serial.println("Connected!");
              client.println("PUT /v2/feeds/" + String(feedID) + ".json HTTP/1.0");
              client.println("Host: api.xively.com");
              client.println("X-ApiKey: " + String(API_key));
              client.println("Content-Length: " + String(length));
              client.print("Connection: close");
              client.println();
              client.print(data);
              client.println();
              digitalWrite(STAT1, LOW); //Blink stat LED 
              digitalWrite(STAT2, LOW); //Blink stat LED
       } 
       else {
              Serial.println(F("Connection failed"));
              client.stop();
              return;
       } 
       
       
       
       while (client.connected()) {
    
          while (client.available()) {
            char c = client.read();
            // Serial.print(c);
            }
            
            client.stop();
      }
      
      
      delay(1000);     
   }
   else {
     Serial.println("Client Failure");
   }

  
}