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 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:
but i don't know how can i send each read every 30 mins to myweb...
delay(1800000) // 1800000 miliseconds are 30 minutes
Also, you can use a while loop with time functions:
unsigned long timeToConnect = millis();
while((millis() - timeToConnect) < 1800000);
For example (mixing GSM Web Client example and your link):
/* 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
}
}
