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Hi everyone!
thanks for the info in this fantastic forum.
I read a lot of info about "gsm shield" but i don't know how i can do this: (let me explain the situation)

ARDUINO + TEMPERATURE SENSOR + SD CARD SHIELD + GSM SHIELD

Arduino reads temperature every 30 mins.
Write on the SD the temperature.
and..... i want to send via gprs the last read to a web. (www.mywebtemperature.) only each read every 30 mins and in my web i'll store all the reads.

i use this fantastic tutorial:
http://learn.adafruit.com/adafruit-data-logger-shield/light-and-temperature-logger

but i don't know how can i send each read every 30 mins to myweb...

Thanks for your opinions!





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Hi,

You can use a delay after each read & connection:
Code:
delay(1800000) // 1800000 miliseconds are 30 minutes

Also, you can use a while loop with time functions:
Code:
unsigned long timeToConnect = millis();
while((millis() - timeToConnect) < 1800000); 

For example (mixing GSM Web Client example and your link):
Code:

/* Sensor test sketch
  for more information see http://www.ladyada.net/make/logshield/lighttemp.html
  */

#include <GSM.h>
#define aref_voltage 3.3         // we tie 3.3V to ARef and measure it with a multimeter!

#define PINNUMBER ""

// APN data
#define GPRS_APN       "GPRS_APN" // replace your GPRS APN
#define GPRS_LOGIN     "login"    // replace with your GPRS login
#define GPRS_PASSWORD  "password" // replace with your GPRS password

// initialize the library instance
GSMClient client;
GPRS gprs;
GSM gsmAccess;

// URL, path & port
char server[] = "www.yourwebtemperature.com";
char path[] = ""; // Your path (For example: /temperature/receiver.php)
int port = 80; // port 80 is the default for HTTP
const unsigned int kNetworkTimeout = 30*1000;
const unsigned int kNetworkDelay = 1000;

int photocellPin = 0;     // the cell and 10K pulldown are connected to a0
int photocellReading;     // the analog reading from the analog resistor divider
 
//TMP36 Pin Variables
int tempPin = 1;        //the analog pin the TMP36's Vout (sense) pin is connected to
                        //the resolution is 10 mV / degree centigrade with a
                        //500 mV offset to allow for negative temperatures
int tempReading;        // the analog reading from the sensor
   
void setup(void) {
  // We'll send debugging information via the Serial monitor
  Serial.begin(9600);   
 
  // If you want to set the aref to something other than 5v
  analogReference(EXTERNAL);

  boolean notConnected = true;
 
  // After starting the modem with GSM.begin()
  // attach the shield to the GPRS network with the APN, login and password
  while(notConnected)
  {
    if((gsmAccess.begin(PINNUMBER)==GSM_READY) &
        (gprs.attachGPRS(GPRS_APN, GPRS_LOGIN, GPRS_PASSWORD)==GPRS_READY))
      notConnected = false;
    else
    {
      Serial.println("Not connected");
      delay(1000);
    }
  }
}
 
 
void loop(void) {
  photocellReading = analogRead(photocellPin); 
 
  Serial.print("Light reading = ");
  Serial.print(photocellReading);     // the raw analog reading
 
  // We'll have a few threshholds, qualitatively determined
  if (photocellReading < 10) {
    Serial.println(" - Dark");
  } else if (photocellReading < 200) {
    Serial.println(" - Dim");
  } else if (photocellReading < 500) {
    Serial.println(" - Light");
  } else if (photocellReading < 800) {
    Serial.println(" - Bright");
  } else {
    Serial.println(" - Very bright");
  }
 
  tempReading = analogRead(tempPin); 
 
  Serial.print("Temp reading = ");
  Serial.print(tempReading);     // the raw analog reading
 
  // converting that reading to voltage, which is based off the reference voltage
  float voltage = tempReading * aref_voltage / 1024;
 
  // print out the voltage
  Serial.print(" - ");
  Serial.print(voltage); Serial.println(" volts");
 
  // now print out the temperature
  float temperatureC = (voltage - 0.5) * 100 ;  //converting from 10 mv per degree wit 500 mV offset
                                               //to degrees ((volatge - 500mV) times 100)
  Serial.print(temperatureC); Serial.println(" degrees C");
 
  // now convert to Fahrenheight
  float temperatureF = (temperatureC * 9 / 5) + 32;
  Serial.print(temperatureF); Serial.println(" degrees F");
 
  // if you get a connection, report back via serial:
  if (client.connect(server, port))
  {
    // Cast float to String for send temperature with 2 decimals (Example result: 23.34)
    char buffer[12];
    dtostrf(temperatureC, 4, 2, buffer);

    Serial.println("connected");
    // Make a HTTP request:
    // For example, a POST request with temperatureC data
    client.print("POST ");   
    client.print(path);
    client.println(" HTTP/1.0");
    client.print("Host: ");
    client.println(host);
    client.println("Content-Type: application/x-www-form-urlencoded"); // If you use a form in your website 
    client.print("Content-Length: ");
    client.println(strlen(buffer));  // Size (XX.XX = 5 characters)
    client.println();

    // Send temperature
    client.print(buffer);

    unsigned long timeoutStart = millis();

    // if there are incoming bytes available
    // from the server, read them and print them:
    while((client.connected() || client.available()) &&
    ((millis() - timeoutStart) < kNetworkTimeout))
    {   
      if (client.available())
      {
        char c = client.read();
        Serial.print(c);
      }
    }
    else
      delay(kNetworkDelay);

    client.stop();
 
    // If connection is finished succesfully, wait 30 minutes
    unsigned long timeToConnect = millis();
    while((millis() - timeToConnect) < 1800000);

  }
  else
  {
    Serial.println("connection failed");
    // if you didn't get a connection to the server, try again
  } 

}


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 smiley-eek smiley-eek smiley-eek
fantastic !!!
i'll try your solution.
really, really thanks!!!
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