problem of reading inputs to send SMS

hello all,

i wrote code send 1 sms if input high , , if low , high again,an sms sent,but code,nothing happened,just when turn gprs on,an sms sent , nothing happened again.
thank helping in advance.

code: [select]

#include<softwareserial.h>
softwareserial sim900(7, 8);

#include <softwareserial.h>
#include "timerone.h"

const int di = 2;
const int dt = 3;
const int dgp1 = 4;
const int dgp2 = 5;
const long interval = 5000000; // in microseconds

int value1 = 0;
int value2 = 0;
int value3 = 0;
int value4 = 0;

int value1_old = 0;
int value2_old = 0;
int value3_old = 0;
int value4_old = 0;

boolean changed1 = false;
boolean changed2 = false;
boolean changed3 = false;
boolean changed4 = false;

void setup() {
  pinmode(di, input);
  pinmode(dt, input);
  pinmode(dgp1, input);
  pinmode(dgp2, input);

  sim900.begin(19200);
  timer1.initialize(interval);
  timer1.attachinterrupt(isr_timer);                           
}

void isr_timer(){
  if (changed1) {
    sendsms1();
    changed1 = false;
  }

  if (changed2) {
    sendsms2();
    changed2 = false;
  }

  if (changed3) {
    sendsms3();
    changed3 = false;
  }
 
  if (changed4) {
    sendsms4();
    changed4 = false;
  }
}

void loop() {
  value1 = digitalread (di);
  value2 = digitalread (dt);
  value3 = digitalread (dgp1);
  value4 = digitalread (dgp2);
 
  if (value1 != value1_old && value1 == high){
    changed1 = true;
    value1_old = value1;
   }
 
  if (value2 != value2_old && value2 == high){
    changed2 = true;
    value2_old = value2;
   }
 
  if (value3 != value3_old && value3 == high){
    changed3 = true;
    value3_old = value3;
   }
   
  if (value4 != value4_old && value4 == high){
    changed4 = true;
    value4_old = value4;
   }
 }

void sendsms1(){
  sim900.print("at+cmgf=1\r");
  delay(100); 
  sim900.println("at + cmgs = \"xxxxxxxxx\""); 
  delay(100);   
  sim900.println("steppe 85: error 1");
  delay(100);   
  sim900.println((char)26); 
  delay(100);   
  sim900.println();
  delay(5000); 
}

void sendsms2(){
  sim900.print("at+cmgf=1\r");   
  delay(100);   
  sim900.println("at + cmgs = \"xxxxxxxxx\"");
  delay(100);   
  sim900.println("steppe 85: error 2");
  delay(100);   
  sim900.println((char)26); 
  delay(100);   
  sim900.println(); 
  delay(5000);   
}

void sendsms3(){
  sim900.print("at+cmgf=1\r"); 
  delay(100);   
  sim900.println("at + cmgs = \"xxxxxxxxx\""); 
  delay(100);   
  sim900.println("steppe 85: error 3");     
  delay(100);   
  sim900.println((char)26);     
  delay(100);   
  sim900.println(); 
  delay(5000);   
} 

void sendsms4(){
  sim900.print("at+cmgf=1\r"); 
  delay(100);   
  sim900.println("at + cmgs = \"xxxxxxxx\"");   
  delay(100); 
  sim900.println("steppe 85: error 4");   
  delay(100);   
  sim900.println((char)26);     
  delay(100);   
  sim900.println(); 
  delay(5000);   
}

code: [select]

    sendsms1();
in isr? not in wildest dreams!

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