SMOKE ALARM

A smoke detector is a device that senses smoke, typically as an indicator of fire. Commercial security devices issue a signal to a fire alarm control panel as part of a fire alarm system, while household smoke detectors, also known as smoke alarms, generally issue a local audible or visual alarm from the detector itself or several detectors if there are multiple smoke detectors interlinked.

CIRCUIT DIAGRAM

CODE

//import LiquidCrystal library
#include<LiquidCrystal.h>

LiquidCrystal lcd(13, 12, 11, 10, 9, 8);

int gasSensorA = A5;
int sensorValue = 0;

void setup()
{
 
  pinMode(A5, INPUT);
  Serial.begin(9600);
  pinMode(7, OUTPUT);
  lcd.begin(16, 2);
}


void loop()
{
   sensorValue = analogRead(gasSensorA);
   Serial.println(sensorValue, DEC);
   if (sensorValue > 20)
   {
     sensorValue = analogRead(A5);
     Serial.println(sensorValue);
     digitalWrite(7, HIGH);
     {
       lcd.begin(16, 2);
       lcd.print("   DONT PANIC  ");
       lcd.setCursor(0,1);
       lcd.print("   DIAL 101  ");
       delay(200);
     }
     for(int PositionCount=0;PositionCount<16; PositionCount++)
     {
       lcd.scrollDisplayLeft();
       delay(150);
     }   
   }
   else 
   {
     lcd.begin(16, 2);
     lcd.print("              HELLO          ");
     lcd.setCursor(0,1);
     lcd.print("        HAVE A GREAT DAY       ");
     digitalWrite(4, HIGH);
   }
   for(int PositionCount=0;PositionCount<16; PositionCount++)
   {
     lcd.scrollDisplayLeft();
     delay(150);
   }  
}