how to get my GSM shield to send an accumulated switch count

Ive got my Uno and Tinysine GSM shield counting the number of times my switch has closed and it displays nicely in the serial print.

But now I want to send that accumulated number say every 5mins (it will evetually be every 24hrs).

So how do I get the myval += 0.2; line to accumulate that number then send it as a text?

(it adds up in incriments of 0.2)

Thanks

sketch below

#include “SIM900.h”
#include <SoftwareSerial.h>

#include “sms.h”
SMSGSM sms;

/*
State change detection (edge detection)

Often, you don’t need to know the state of a digital input all the time,
but you just need to know when the input changes from one state to another.
For example, you want to know when a button goes from OFF to ON. This is called
state change detection, or edge detection.

This example shows how to detect when a button or button changes from off to on
and on to off.

The circuit:

  • pushbutton attached to pin 2 from +5V
  • 10K resistor attached to pin 2 from ground
  • LED attached from pin 13 to ground (or use the built-in LED on
    most Arduino boards)

created 27 Sep 2005
modified 30 Aug 2011
by Tom Igoe

This example code is in the public domain.

http://arduino.cc/en/Tutorial/ButtonStateChange

*/

// this constant won’t change:
const int buttonPin = 4; // the pin that the pushbutton is attached to
const int ledPin = 13; // the pin that the LED is attached to

// Variables will change:
int buttonPushCounter = 0; // counter for the number of button presses
int buttonState = 0; // current state of the button
int lastButtonState = 0; // previous state of the button
float myval;

int numdata;
boolean started=false;
char smsbuffer[160];
char n[20];

//debug begin
char sms_position;
char phone_number[20]; // array for the phone number string
char sms_text[100];
int i;
//debug end

void setup()
{
// initialize the button pin as a input:
pinMode(buttonPin, INPUT);
// initialize the LED as an output:
pinMode(ledPin, OUTPUT);
// initialize serial communication:
Serial.begin(9600);
Serial.println (“power on”);
if (gsm.begin(4800));
if (sms.SendSMS("+27630812488", “power on”));
}

void loop() {
// read the pushbutton input pin:
buttonState = digitalRead(buttonPin);

// compare the buttonState to its previous state
if (buttonState != lastButtonState) {
// if the state has changed, increment the counter
if (buttonState == HIGH) {
// if the current state is HIGH then the button
// wend from off to on:
buttonPushCounter++;
myval += 0.2;
Serial.print("Rainfall: ");
Serial.print (myval);
Serial.println(“mm”);

}
else {
// if the current state is LOW then the button
// wend from on to off:
}
// Delay a little bit to avoid bouncing
delay(50);
}
// save the current state as the last state,
//for next time through the loop
lastButtonState = buttonState;

// turns on the LED every four button pushes by
// checking the modulo of the button push counter.
// the modulo function gives you the remainder of
// the division of two numbers:
if (buttonPushCounter % 4 == 0) {
digitalWrite(ledPin, HIGH);
} else {
digitalWrite(ledPin, LOW);
}

}