Explain me what this code does

hello everybody!

im new arduino , programming regarding it. have code alarm system made , works perfect, need understanding actual code because ive put pieces, examples, tutorials , on. kinda know c/c++ programming arduino little different , knowledge of 2 languages isn't perfect either. maybe enlighten me , explain me how code put , in every section?

i very thankful!  

code: [select]

#include "sim900.h"
#include <softwareserial.h>
#include "sms.h"
#include "sodaq_ds3231.h"
#include <wire.h>

smsgsm sms;
string smstext = "movement at  ";
boolean started=false;
char sms_text[160];
int ledpin = 13;
int pirpin = 7;
int val = 0;

void setup()
{
  wire.begin();
  rtc.begin();
  pinmode (ledpin,output);
  pinmode (pirpin, input);
  serial.begin(3000);
  if (gsm.begin(3000))
    {
        serial.println("\nstatus=ready");
        started=true;
    }
    else
        serial.println("\nstatus=idle");
}
void loop ()
{
 
  string timestamp;
  val = digitalread(pirpin);
  digitalwrite(ledpin,val);

if (val == 1)
{
  timestamp = getdatetime();
  serial.println(timestamp);
  smstext = smstext+timestamp;
  smstext.tochararray(sms_text,160);
  sms.sendsms("number",sms_text); //insert phone number here!!!
  string smstext = "movement @ ";
  delay(2000);
}
 
}

string getdatetime()
{
   datetime = rtc.now(); //gets real time
 
  string timestring;
  string hourstring;
  string minutestring;
 
  if(now.hour() <10)
  {
     hourstring = "0"+string(now.hour()); 
  }else
  {
    hourstring = string(now.hour());
  }

  if(now.minute() <10)
  {
    minutestring = "0"+string(now.minute());
  }else
  {
     minutestring = string(now.minute());
  }

  timestring = hourstring+":"+minutestring+" "+string(now.month())+"/"+string(now.date())+"/"+string(now.year());
  return timestring;
}


quote

. kinda know c/c++ programming arduino little different

no, it's c++.

you've got strange serial line speeds there

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