How To Make An Automatic Door And Doorbell

1int firstIRsensor=A0; // connect first ir sensor module to arduino input  pin A0
2int secondIRsensor=A1; // connect the second IR sensor module to the arduino  input pin A1
3
4int firstinput=12; // second pin of l293d is connected to arduino  pin 12
5int secondinput=11; // seventh pin of l293d is connected to arduino pin  11
6int musicpin=10; // the musical circuit input pin is connected to arduino  pin 10;
7float a;  // declare two variables
8float b;
9
10void setup()
11{
12  Serial.begin(9600);  
13  pinMode(firstIRsensor,INPUT); // declare the pin modes
14  pinMode(secondIRsensor,INPUT);
15  pinMode(firstinput,OUTPUT);
16  pinMode(secondinput,OUTPUT);
17  pinMode(musicpin,OUTPUT);
18}
19
20void loop()
21{
22  a=analogRead(firstIRsensor);
23  // take the reading of the first ir sensor module
24  if(a>300) // if the reading  is greater than 400
25  {
26    digitalWrite(musicpin,HIGH); // someone is outside  the door or room so ring the bell automatically
27    digitalWrite(firstinput,LOW);  // the door close
28    digitalWrite(secondinput,LOW);
29    delay(10000);     //  ring the bell for 10 seconds
30    
31   
32    inside();  // after 10 seconds  call a function, name inside()
33  }
34  if(a<300) // if the value is less than  400 that means no one is outside the door
35  {
36    
37    digitalWrite(musicpin,LOW);  
38    digitalWrite(firstinput,LOW); 
39    digitalWrite(secondinput,LOW);
40  }
41}
42
43void inside()  
44{
45  digitalWrite(musicpin,LOW); // stop ringing  the bell
46    digitalWrite(firstinput,LOW); 
47    digitalWrite(secondinput,LOW);
48    delay(8000);   // wait for 8 seconds
49  b=analogRead(secondIRsensor); // take  the reading from the second ir module sensor
50Serial.println(b);
51    if(b>300)
52
53{
54  digitalWrite(musicpin,LOW);
55  digitalWrite(firstinput,LOW);   // rotate the  motor anti clock wise, thus the door will open
56  digitalWrite(secondinput,HIGH);
57  delay(2000); 
58   digitalWrite(musicpin,LOW);
59  digitalWrite(firstinput,LOW);    
60  digitalWrite(secondinput,LOW);
61  delay(5000);     // open  the door  for 5 seconds
62   digitalWrite(musicpin,LOW);
63  digitalWrite(firstinput,HIGH);   // rotate the motor clockwise, then the door will close
64  digitalWrite(secondinput,LOW);
65  delay(2000);
66   digitalWrite(musicpin,LOW);
67  digitalWrite(firstinput,LOW);   // stop the motor
68  digitalWrite(secondinput,LOW);
69 delay(3000); 
70}
71if(b<300)
72{
73   digitalWrite(musicpin,LOW);    // no one is there so close everything
74  digitalWrite(firstinput,LOW);   
75  digitalWrite(secondinput,LOW);
76  delay(3000);
77}
78
79// end the  function, return back to the loop function
80}
81
82