Security System Using PIR Sensor

1#include <LiquidCrystal.h>
2
3// C++ code
4/*
5Security system  using PIR sensor
6Made by Roshan Baig
7*/
8LiquidCrystal lcd(2,3,4,5,6,7);
9int  ledPin = 12;
10const int PIRPin = 8;
11int pirState = LOW;
12int val = 0;
13int  photoCellPin = A0;
14int photoCellReading;
15int speakerPin = 10;
16void setup()
17{
18  lcd.begin(16,2);
19  pinMode(ledPin, OUTPUT);
20  pinMode(PIRPin, INPUT);
21  pinMode(photoCellPin, INPUT);
22  pinMode(speakerPin, INPUT);
23  Serial.begin(9600);
24  lcd.setCursor(0,0);
25  lcd.print("P.I.R Motion And");
26  lcd.setCursor(0,1);
27  lcd.print("light sensors");
28  delay(2000);
29  lcd.clear();
30  lcd.setCursor(0,0);
31  lcd.print("Processing Data.");
32  playTone(300,300);
33  delay(150);
34  playTone(0,0);
35  delay(3000);
36  lcd.clear();
37  lcd.setCursor(3,0);
38  lcd.print("Waiting For");
39  lcd.setCursor(3,1);
40  lcd.print("Motion...");
41}
42
43void  loop()
44{
45  val = digitalRead(PIRPin);
46  photoCellReading = analogRead(photoCellPin);
47  if(val == HIGH)
48  {
49    digitalWrite(ledPin, HIGH);
50    if(pirState ==  LOW)
51    {
52      Serial.println("Motion Detected");
53      lcd.clear();
54      lcd.setCursor(0,0);
55      lcd.print("Motion Detected");
56      lcd.setCursor(0,1);
57      lcd.print(photoCellReading);
58      playTone(300,300);
59      delay(150);
60      playTone(0,0);
61      pirState = HIGH;
62    }
63  } else
64  {
65    digitalWrite(ledPin,  LOW);
66    delay(300);
67    scrollScreenSaver();
68    if(pirState == HIGH)
69    {
70      Serial.println("Motion Ended");
71      pirState = LOW;
72    }
73  }
74}
75void playTone(long duration, int freq)
76{
77  duration *= 1000;
78  int period = (1.0/freq)*100000;
79  long elapsed_time = 0;
80  while(elapsed_time  < duration)
81  {
82    digitalWrite(13, HIGH);
83    digitalWrite(speakerPin,  HIGH);
84    delayMicroseconds(period/2);
85    digitalWrite(13, LOW);
86    digitalWrite(speakerPin,  LOW);
87    delayMicroseconds(period/2);
88    elapsed_time += (period);
89  }
90}
91void  scrollScreenSaver()
92{
93  lcd.clear();
94  lcd.setCursor(15,0);
95  lcd.print("No  Motion");
96  lcd.setCursor(15,1);
97  lcd.print("Waiting");
98  for(int i  = 0; i < 22; i++)
99  {
100    lcd.scrollDisplayLeft();
101    delay(150);
102  }
103}