Home automation using relay

1// declare integer variables
2int PIR = 0;
3int temp = 0;
4int IR  = 0;
5int gas = 0;
6void setup()
7{
8  // declare inputs
9  pinMode(6,  INPUT);
10  pinMode(7, INPUT);
11  pinMode(5, INPUT);
12  pinMode(4, INPUT);
13  // declare outputs
14  pinMode(13, OUTPUT);
15  pinMode(12, OUTPUT);
16  pinMode(11,  OUTPUT);
17  pinMode(10, OUTPUT);
18  // begin the serial port with a baud rate  of 9600
19  Serial.begin(9600);
20}
21void loop()
22{
23  // declare variables
24  PIR = digitalRead(4);
25  temp = analogRead(5);
26  IR = digitalRead(7);
27  gas = analogRead(6);
28  // if else statements
29  if(temp >= 500)
30  {
31    digitalWrite(12, HIGH);
32    Serial.println("fan on");
33  }else
34  {
35    digitalWrite(12, LOW);
36    Serial.println("fan off");
37  }
38  if(PIR  == 1)
39  {
40    digitalWrite(13, HIGH);
41    Serial.println("lights on");
42  }else
43  {
44     digitalWrite(13, LOW);
45    Serial.println("lights off");
46  }
47  if(gas >= 200)
48  {
49     digitalWrite(10, HIGH);
50    Serial.println("gas  leak");
51  }else
52  {
53    digitalWrite(10, LOW);
54  }
55  if( IR == 1)
56  {
57    digitalWrite(11, HIGH);
58    Serial.print("signal received");
59  }else
60  {
61    digitalWrite(11, LOW);
62  }
63  delay(30);// delay 30 milliseconds  to let things settle
64}

1// declare integer variables
2int PIR = 0;
3int temp = 0;
4int IR
5  = 0;
6int gas = 0;
7void setup()
8{
9  // declare inputs
10  pinMode(6,
11  INPUT);
12  pinMode(7, INPUT);
13  pinMode(5, INPUT);
14  pinMode(4, INPUT);
15
16  // declare outputs
17  pinMode(13, OUTPUT);
18  pinMode(12, OUTPUT);
19  pinMode(11,
20  OUTPUT);
21  pinMode(10, OUTPUT);
22  // begin the serial port with a baud rate
23  of 9600
24  Serial.begin(9600);
25}
26void loop()
27{
28  // declare variables
29
30  PIR = digitalRead(4);
31  temp = analogRead(5);
32  IR = digitalRead(7);
33
34  gas = analogRead(6);
35  // if else statements
36  if(temp >= 500)
37  {
38
39    digitalWrite(12, HIGH);
40    Serial.println("fan on");
41  }else
42  {
43
44    digitalWrite(12, LOW);
45    Serial.println("fan off");
46  }
47  if(PIR
48  == 1)
49  {
50    digitalWrite(13, HIGH);
51    Serial.println("lights on");
52
53  }else
54  {
55     digitalWrite(13, LOW);
56    Serial.println("lights off");
57
58  }
59  if(gas >= 200)
60  {
61     digitalWrite(10, HIGH);
62    Serial.println("gas
63  leak");
64  }else
65  {
66    digitalWrite(10, LOW);
67  }
68  if( IR == 1)
69
70  {
71    digitalWrite(11, HIGH);
72    Serial.print("signal received");
73
74  }else
75  {
76    digitalWrite(11, LOW);
77  }
78  delay(30);// delay 30 milliseconds
79  to let things settle
80}