SMS BASED ELECTRONIC NOTICE BOARD USING GSM AND ARDUINO

code: 

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x3F, 16, 2); 

#include <SoftwareSerial.h>

#include <String.h>

int led=13;

int temp=0,i=0,x=0,k=0;

char str[100],msg[32];

SoftwareSerial SIM800(10 , 11);

void setup() 

{

    lcd.begin();

  lcd.backlight();

  SIM800.begin(9600);

  pinMode(led, OUTPUT);

  digitalWrite(led, HIGH);

  lcd.print("GSM Initilizing...");

  gsm_init();

  lcd.setCursor(0,0);

  lcd.print("Wireless Notice");

  lcd.setCursor(0,1);

  lcd.print("    Board      ");

  delay(2000);

  lcd.clear();

  lcd.print("Anto's ATL E-Logger");

  delay(500);

  lcd.setCursor(0,1);

  lcd.print("System Ready");

  SIM800.println("AT+CNMI=2,2,0,0,0");

  delay(500);

  SIM800.println("AT+CMGF=1");

  delay(1000);

  digitalWrite(led, LOW);

}

void loop()    

{

  for(unsigned int t=0;t<30000;t++)

  {

    SIM800Event();

  if(temp==1)

  {

    x=0,k=0,temp=0;

    while(x<i)

    {

      while(str[x]=='#')

      {

        x++;

        while(str[x]!='*')

        {

          msg[k++]=str[x++];

        }

      }

      x++;

    }

    msg[k]='\0';

    lcd.clear();

    lcd.print(msg);

    delay(300);

    temp=0;

    i=0;

    x=0;

    k=0;

  }

  }

  lcd.scrollDisplayLeft();

}

void SIM800Event()

{

  while(SIM800.available())

  {

    char ch=(char)SIM800.read();

    str[i++]=ch;

    if(ch == '*')

    {

      temp=1;

      lcd.clear();

      lcd.print("Message Received");

      delay(1000);

    }

  }

}

void gsm_init()

{

  lcd.clear();

  lcd.print("Finding Module..");

  boolean at_flag=1;

  while(at_flag)

  {

    SIM800.println("AT");

    while(SIM800.available()>0)

    {

      if(SIM800.find("OK"))

      at_flag=0;

    }

    delay(1000);

  }

  lcd.clear();

  lcd.print("Module Connected..");

  delay(1000);

  lcd.clear();

  lcd.print("Disabling ECHO");

  boolean echo_flag=1;

  while(echo_flag)

  {

    SIM800.println("ATE0");

    while(SIM800.available()>0)

    {

      if(SIM800.find("OK"))

      echo_flag=0;

    }

    delay(1000);

  }

  lcd.clear();

  lcd.print("Echo OFF");

  delay(1000);

  lcd.clear();

  lcd.print("Finding Network..");

  boolean net_flag=1;

  while(net_flag)

  {

    SIM800.println("AT+CPIN?");

    while(SIM800.available()>0)

    {

      if(SIM800.find("+CPIN: READY"))

      net_flag=0;

    }

    delay(1000);

  }

  lcd.clear();

  lcd.print("Network Found..");

  delay(1000);

  lcd.clear();

}