Industrial and Home Security System

 // LPG PIN
  //LPG AND SMOKE PIN DETECT ALARM

  
void setup() 
{
  
  Serial.begin(9600); 
  pinMode(13,OUTPUT);
pinMode (12,OUTPUT); //PIR OUTPUT SINGNAL
pinMode (3, INPUT);  // PIR INPUT PIN
int tempsense = 0;
int rhsense = 0;
int temp = 0;
int rh = 0;
 
 tempsense = (analogRead(1));
 rhsense = (analogRead(0));
}

void loop()
{
{
goto LPG_ND_SMOKE;

goto TEMP_AND_HUMIDITY;
             
goto PIR;



goto HighVoltage;

}

LPG_ND_SMOKE:
{
  const int analogInPin =2;
  int ledPin = 7;
  int sensorValue = 0; 
  
  sensorValue = analogRead(analogInPin);            
  
  if (sensorValue >=550)
  
  {
    digitalWrite(ledPin, HIGH);   
  }
  else if (sensorValue>=400)
  
  {
  digitalWrite(ledPin, HIGH);  
  }
else

digitalWrite(ledPin, LOW);

  
  Serial.print("sensor = " );                       
  Serial.println(sensorValue);     

  delay(10);                     
}

PIR:
{
  int val=0;
val = digitalRead(8);
digitalWrite(13,val);

if (val == 1)
{
digitalWrite(13,LOW);
}

else
{
Serial.print("LOW PIR" ); 
}
 
}

TEMP_AND_HUMIDITY:
{
int tempsense = 0;
int rhsense = 0;
int temp = 0;
int rh = 0;
 
 tempsense = (analogRead(1));
 rhsense = (analogRead(0));
 temp = (tempsense/50);
 rh = ((30.855*(rhsense/204.6))-11.504);
 
 Serial.print("Temperature: ");
 Serial.print(temp);
 Serial.println(" C ");
 
 delay(100);
 Serial.print("Humidity: ");
 Serial.print(rh);
 Serial.println("% "); 
                                            
 delay(1000);
}

HighVoltage:
{
int  max_volt = 255;
int present_main_volt;
float volt;
present_main_volt=analogRead(5);
volt=(5/ max_volt* present_main_volt);


if (volt ==00)
if(volt ==3.177)
if(volt ==3.50)
if(volt==4.00)
if(volt== 4.50)
goto OFF;

}

OFF:
{
  digitalWrite(7,HIGH);
  delay(1000);
  digitalWrite(7,LOW);
}
  
}