confirm the code

/*  --start of comment
* Project name:
     LPG Detector

Description:
    A project that detects LPG gas leaks.

  Created By:
   Salim

  Version 1.2
 01/04/2012

  Version 1
 12/17/2011

  Test configuration:
     MCU:       PIC16F877
     Oscillator:      8000000 Hz
     SW:        mikroC PRO for PIC

  -- end of comment */
// Lcd pinout settings
sbit LCD_RS at RB0_bit;
sbit LCD_EN at RB1_bit;
sbit LCD_D4 at RB2_bit;
sbit LCD_D5 at RB3_bit;
sbit LCD_D6 at RB4_bit;
sbit LCD_D7 at RB5_bit;

// Pin direction
sbit LCD_RS_Direction at TRISB0_bit;
sbit LCD_EN_Direction at TRISB1_bit;
sbit LCD_D4_Direction at TRISB2_bit;
sbit LCD_D5_Direction at TRISB3_bit;
sbit LCD_D6_Direction at TRISB4_bit;
sbit LCD_D7_Direction at TRISB5_bit;


//status LEDs are mapped to sbit variables
sbit GREEN_LED at RE1_bit;
sbit RED_LED at RE2_bit;

void MCU_Init();
void Lcd_Init();
void SendMessage();
void CheckGasSensor();
void UpdateLCD();
void UpdateLEDs();
void SolenoidDisableGas();


//Global sensor status code value
int SENSOR_STATUS_CODE = 0;

//Global gas concentration level
double GAS_CONCENTRATION_LEVEL = 0.0;


void main()
{
  //Set up the MCU
   MCU_Init();

  //Set up the ADC
  ADC_Init();

  //Set up LCD screen
  Lcd_Init();
  Lcd_Out(1, 1, "LPG Detector");
  Lcd_Cmd(_LCD_CURSOR_OFF);


  //Program Run loop
  while(1){
    //Check for a sensor reading
    CheckGasSensor();

    //Update the text on the LCD Screen
    UpdateLCD();

    //Update the Red and Green status LEDs
    UpdateLEDs();

    //Shut off the gas if the gas level is dangerous
    if(SENSOR_STATUS_CODE == 2){
      SolenoidDisableGas();
    }

    //Send a GSM message if there is an error
    if(SENSOR_STATUS_CODE != 0){
      SendMessage();
    }

    //Wait a 1/2 second between updates
    Delay_ms(500);
  }

}






void MCU_Init()
{
 ANSEL = 0x08; // Configure AN5 pin as analog input
 C1ON_bit = 0; // Disable comparators
 C2ON_bit = 0;

 //GIE = 1;      // Global interrupt is enabled

  TRISA = 0;    // PORTA is output
  TRISE = 0xFF; // PORTE is input
}



//Check for a sensor reading
void CheckGasSensor(){
        long int tlong;
        long ch;
        double GAS_CONCENTRATION_LEVEL;
        unsigned int temp;  //This creates a 10 bit number
        temp = ADC_Read(5); // Read the ADC value from ADC Channel 5

        Lcd_Out(2,1,"gas Detector");    // Write result in the second line
        tlong = ADC_Read(5)* 5000;         // Convert the result in millivolts
        tlong = tlong / 1023;        // 0..1023 -> 0-5000mV

        ch = tlong / 1000;           // Extract volts (thousands of millivolts)
                                     // from result
        Lcd_Chr(2,9,48+ch);          // Write result in ASCII format
        Lcd_Chr_CP('.');
        ch = (tlong / 1000) % 10;     // Extract thousands of millivolts
        Lcd_Chr_CP(48+ch);
        ch = (tlong / 100) % 10;     // Extract hundreds of millivolts
        Lcd_Chr_CP(48+ch);           // Write result in ASCII format
        ch = (tlong / 10) % 10;      // Extract tens of millivolts
        Lcd_Chr_CP(48+ch);           // Write result in ASCII format
        ch = tlong % 10;             // Extract digits for millivolts
        Lcd_Chr_CP(48+ch);           // Write result in ASCII format
        Lcd_Chr_CP('V');
        Delay_ms(1);
        GAS_CONCENTRATION_LEVEL = temp*0.02;   // multiply max ADC value by 0.02 to scale it to 20.48
        if(   (GAS_CONCENTRATION_LEVEL > 100)   &&  (GAS_CONCENTRATION_LEVEL < 300) ){
        //Sets the sensor status code to 1 (warning level)
       //if the gas is between 100 and 300 ppm
    SENSOR_STATUS_CODE = 1;
  }
  else if(GAS_CONCENTRATION_LEVEL > 300){
    //Sets the sensor status code to 2 (danger level)
    //if the gas is above 300 ppm
    SENSOR_STATUS_CODE = 2;
  }
  else{
    //Sets the sensor status code to 0 (okay)
    SENSOR_STATUS_CODE = 0;
  }

}




//Update the text on the LCD Screen
void UpdateLCD(){
  //Check if there are no errors
  if(SENSOR_STATUS_CODE == 0){
    Lcd_Out(2, 1, "Status: Normal   ");
  }
  else if (SENSOR_STATUS_CODE == 1){
    Lcd_Out(2, 1, "Status:Warning!  ");
  }
  else if (SENSOR_STATUS_CODE == 2){
    Lcd_Out(2, 1, "Status:Gas Off  ");
  }
}



//Update the Red and Green status LEDs
void UpdateLEDs(){

  //Check if there are no errors
  if(SENSOR_STATUS_CODE == 0){
    //Status: Normal has the Green LED on
    GREEN_LED = 1;
    RED_LED = 0;
  }
  else if (SENSOR_STATUS_CODE == 1){
    //Status:Warning has the Red LED blinking
    GREEN_LED = 0;

    //Toggle Red LED on / off for a blinking effect
    if(RED_LED){
      RED_LED = 0;
    }
    else{
      RED_LED = 1;
    }

  }
  else if (SENSOR_STATUS_CODE == 2){
    //Status:Gas Off has the Red LED on solid
    GREEN_LED = 0;
    RED_LED = 1;
  }

}



//Shut off the Gas
void SolenoidDisableGas(){
    //Disable the gas by turning on a solenoid
    //choose PORTA and pin RA0 to controls the solenoid
    PORTA.F0 = 1;
}



//Send a GSM message if there is an error
void SendMessage(){
  UART1_Init(9600);

  UART1_Write_Text("AT+CMGS=");       //AT+CMGS=
  Delay_ms(1000);

  UART1_Write(0x22);            //"
  Delay_ms(2000);

  UART1_Write_Text("0060197437650");        // my no
  Delay_ms(2000);

  UART1_Write(0x22);
  UART1_Write(0x0D);            //(CR) means Enter
  Delay_ms(2000);

  UART1_Write_Text("LPG Leak Concentration > 300ppm");   // status text
  UART1_Write(0x0D);            //(CR) means Enter
  Delay_ms(2000);

  UART1_Write(26);             // Ctrl z
  Delay_ms(2000);

  UART1_Write(0x0D);           //(CR) means Enter
  Delay_ms(2000);
}