#include <Wire.h>
 #include <Keypad.h> #include <LiquidCrystal_I2C.h> #include <Servo.h> #include <DHT.h> DHT dht(8,DHT22); //#define 5 5 char inputvalue[5]; char Passcode[5] = "6789"; byte inputcount = 0, passcodecount = 0; char inputKey; Servo myservo; byte rowpins[4]={36,37,38,39}; byte columnpins[4]={40,41,42,43}; char key[4][4]={ {'1','2','3','A'}, {'4','5','6','B'}, {'7','8','9','C'}, {'*','0','#','D'}, }; LiquidCrystal_I2C lcd(0x27,16,2); Keypad keys=Keypad(makeKeymap(key),rowpins,columnpins,4,4);

void setup() 
{
   lcd.init();
    dht.begin();
     myservo.attach(4);
      myservo.write(0);
       pinMode(9, OUTPUT);
        pinMode(7, OUTPUT);
         pinMode(6, INPUT); 
         pinMode(30, OUTPUT);
          pinMode(3, OUTPUT);
           pinMode(2, OUTPUT);
            pinMode(1, OUTPUT); 
            }

void loop()
 { 
  int attempt=0;
   do{
     digitalWrite(7, LOW); 
     delayMicroseconds(2);
      digitalWrite(7, HIGH);
       delayMicroseconds(10);
        digitalWrite(7, LOW);

long duration=pulseIn(6,HIGH);
 int distance=(duration*0.034)/2;
  if (distance<30)
   { 
    lcd.backlight();
     lcd.setCursor(0,0);
      lcd.print("Enter Password:");
       inputKey = keys.getKey();
        if (inputKey)
        { 
          inputvalue[inputcount] = inputKey;
           lcd.setCursor(inputcount,1);
            lcd.print(inputvalue[inputcount]);
             inputcount++;
              }

if(inputcount == 5-1)
{
  lcd.clear();

if(!strcmp(inputvalue, Passcode))
{
    lcd.setCursor(5,0);
    lcd.print("ACCESS");
    lcd.setCursor(5,1);
    lcd.print("GRANTED");
    myservo.write(90);  
    delay(10000);
    myservo.write(0);
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("DOOR IS LOCKED");
    delay(1000);
  }
else{
  digitalWrite(30, HIGH);
  lcd.setCursor(5,0);
  lcd.print("ACCESS");
  lcd.setCursor(5,1);
  lcd.print("DENIED");
  delay(2000);
  digitalWrite(30, LOW);
  attempt+=1;
  }

lcd.clear();
while(inputcount !=0){
inputvalue[inputcount--] = 0; 
}

}
 }
  else
 {
   lcd.clear(); 
   lcd.noBacklight(); 
   } 
   int l= analogRead(A0);
    int ldra=l/4; 
    if(ldra<15){ digitalWrite(9, LOW);
     }
      else
       { 
        analogWrite(9,ldra); 
        }
         float temp=dht.readTemperature();
          if(temp<0)
          {
             digitalWrite(3, HIGH);
             //blue digitalWrite(2, LOW);
             //yellow digitalWrite(1, LOW);/
             /red 
             //delay(1000); 
             }
              else if(temp>0 && temp<40)
              {
                 digitalWrite(3, HIGH);
                 //blue digitalWrite(2, HIGH);/
                 /yellow digitalWrite(1, LOW);
                 //red //delay(1000);
                  }
                   else if(temp>40)
                    {
                       digitalWrite(3, HIGH);
                       //blue digitalWrite(2, HIGH);
                       //yellow digitalWrite(1, HIGH);
                       //red //delay(1000);
                        }
                         } 
                         while(attempt<3);
                          if(attempt==3)
                          {
                             lcd.clear(); 
                             lcd.setCursor(0,0);
                              lcd.print("MAX ATTEMPTS");
                               lcd.setCursor(0,1);
                                lcd.print("REACHED");
                                 attempt=0; 
                                 delay(2000);
                                  lcd.clear();
                                   lcd.noBacklight(); 

 delay(7000); 
 }
 
 
 
  }