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I have very little knowledge of programming ,thank god at last i am able to upload arduino sketch at arduino and able to see value at serial monitor but i am not able to upload sensor data neither at  emoncms.org nor at my local emoncms server so it my very humble request you all please please guide me why i am not able to upload data at emoncms .My eyes are really gona tired to watch my sensor value at emoncms.here is my test   sketch.please help me !!!!

 */

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

// These constants won't change
const int lightSensorPin = A0;
const int threshold = 850;

// humidity and temperature
float temperature = 0, humidity = 0;

// the follow variables are long because the time, measured in miliseconds,
// will quickly become a bigger number than can be stored in an int.
long pulseCount = 0;   

// used to measure power.
unsigned long pulseTime,lastTime;

// power and energy
double power = 0;
double elapsedkWh;

// number of readings we made since the last packet sent :
byte readings = 0;                   

// assign a MAC address for the ethernet controller.
// fill in your address here:
byte mac[] = { 
  0x90, 0xA2, 0xDA, 0x01, 0x66, 0xD6};
  
// fill in an available IP address on your network here,
// for auto configuration:
IPAddress ip(192, 168, 0, 64);
IPAddress subnet(255, 255, 255, 0);
IPAddress gw (192,168,0,1);

// initialize the library instance:
EthernetClient client;

char server[] = "emoncms.org"; //emoncms URL

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 = 4*1000;  // delay between updates, in milliseconds

void setup() {
  // start serial port:
  Serial.begin(9600);
  // give the ethernet module and DHT22 sensor time to boot up:
  delay(1000);
  // Display a welcome message
  Serial.println("emoncms client starting...");
  
  // attempt a DHCP connection:
  Serial.println("Attempting to get an IP address using DHCP:");
  if (!Ethernet.begin(mac)) {
    // if DHCP fails, start with a hard-coded address:
    Serial.println("failed to get an IP address using DHCP, trying manually");
    Ethernet.begin(mac, ip);
  }
  // print the Ethernet board/shield's IP address:
  Serial.print("My IP address: ");
  Serial.println(Ethernet.localIP());
}

void loop() {
  // if the meter flash, increment the counter
  if (analogRead(lightSensorPin) > threshold) {
    while (analogRead(lightSensorPin) > threshold) {}
    //used to measure time between pulses.
    lastTime = pulseTime;
    pulseTime = micros();
    
    //pulseCounter
    pulseCount++;
    
    // we don't want to miss a flash during sending
    readings++;
    
    // calculate power
    power = 3600000000.0 / (pulseTime - lastTime);
    
    // find kwh elapsed
    elapsedkWh = (1.0 * pulseCount)/1000; //multiply by 1000 to pulses per wh to kwh convert wh to kwh
    
    //Print the values
    Serial.print("Power : ");
    Serial.print(power,2);
    Serial.print("W, ");
    Serial.print(elapsedkWh,3);
    Serial.println("kWh");
  }
  
  // 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 at least two seconds have
  // passed sinceyour last connection, then connect again and
  // send data:
  if(!client.connected() && (millis() - lastConnectionTime > postingInterval) && power >= 0 && readings >= 2) {
    
    sendData(power);
    readings = 0;
  }
  // 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(float power) {
  // if there's a successful connection:
  if (client.connect(server, 80)) {
    Serial.println("Connecting...");
    // send the HTTP PUT request:
    client.print("GET /api/post?apikey=<6834396c9feb5********7d973b2d74f>&json={power}");
    client.print(":");
    client.print(power);    
    client.println("} HTTP/1.1");
    client.println("Host: emoncms.org");
    client.println("User-Agent: Arduino-ethernet");
    client.println("Connection: close");
    client.println();

    // note the time that the connection was made:
    lastConnectionTime = millis();
  } 
  else {
    // if you couldn't make a connection:
    Serial.println("Connection failed");
    Serial.println("Disconnecting...");
    client.stop();
  }
}

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