Introduction

In this article, I will explain about security-based Alarm Systems with Arduino Mega 2560. It can be used to identify a person who crossed a line without permission. It can be used in many places like schools, homes, hospitals, colleges, industries, etc.
Parts
  • Arduino Mega 2560.
  • PIR Sensor
  • GSM Module
  • Buzzer
  • LED
GSM
  • GSM means a Global System For Mobile Communication. It is used to send and receive a message in critical areas.
  • It can also act as a GSM modem.
  • It can have a PIN configuration and MIC is also attached.
    Figure 1: GSM Board
PIR Sensor
  • It is used to detect people moving around approximately 10m from the sensor.
  • The actual range is between 5m to 12m.
  • It is of high sensitivity and low noise.
    Figure 2: PIR Sensor
Connection
 Step 1 - Arduino Mega 2560 To GSM Board
  • Connect the RX pin of the GSM board to the 04 of Arduino Mega 2560.
  • Connect the TX pin of the GSM board to the 03 of Arduino Mega 2560.
  • Connect the 5V power supply to the Arduino Mega 2560.
  • At last, connect the 12 DC voltage to the GSM board.
Step 2 - Arduino Mega 2560 To PIR Sensor
  • In the PIR sensor, they have three pins.
  • The first pin can be connected to dc voltage range as 5v.
  • The second pin can be connected to the Arduino board 5 in the digital pin.
Step 3 - Arduino Mega 2560 To LED
  • The Anode(+) pin can be connected to the digital pin 7 to an Arduino board.
  • The cathode(-) pin can be connected to the Gnd to an Arduino board.
Step 4 - Arduino mega 2560 To Buzzer
  • The red color wire can be connected to the digital pin 10 to the Arduino board.
  • The black color wire can be connected to the Gnd to the Arduino board.
  • We can connect both the wires in exchange.
Programming
  1. #include < SoftwareSerial.h >
  2. #include "Timer.h"
  3. const int PIR = 5;
  4. const int TC35TXD0 = 04;
  5. const int TC35RXD0 = 03;
  6. SoftwareSerial mySerial = SoftwareSerial(TC35RXD0, TC35TXD0);
  7. const int siren = 10;
  8. int count;
  9. Timer t;
  10. void setup()
  11. {
  12. pinMode(testswitch, INPUT);
  13. pinMode(testled, OUTPUT);
  14. pinMode(PIR, INPUT);
  15. pinMode(siren, OUTPUT);
  16. pinMode(TC35button, OUTPUT);
  17. mySerial.begin(9600);
  18. digitalWrite(testled, LOW);
  19. digitalWrite(siren, LOW);
  20. digitalWrite(TC35button, HIGH);
  21. count = 0;
  22. }
  23. void loop()
  24. {
  25. if (digitalRead(testswitch) == HIGH)
  26. {
  27. if (digitalRead(PIR) == HIGH)
  28. {
  29. digitalWrite(testled, HIGH);
  30. } else {
  31. digitalWrite(testled, LOW);
  32. }
  33. }
  34. if (digitalRead(testswitch) == LOW)
  35. {
  36. digitalWrite(testled, LOW);
  37. delay(15000);
  38. digitalWrite(siren, HIGH);
  39. delay(500);
  40. digitalWrite(siren, LOW);
  41. delay(15000);
  42. digitalWrite(siren, HIGH);
  43. delay(500);
  44. digitalWrite(siren, LOW);
  45. delay(500);
  46. digitalWrite(siren, HIGH);
  47. delay(500);
  48. digitalWrite(siren, LOW);
  49. while (count < 2)
  50. {
  51. t.update();
  52. }
  53. digitalWrite(TC35button, LOW);
  54. delay(1000);
  55. digitalWrite(TC35button, HIGH);
  56. delay(20000);
  57. mySerial.print("AT+CMGF=1\r");
  58. delay(1000);
  59. mySerial.print("AT+CMGS=\"+xxxxxxxxxxxx\"\r");
  60. delay(1000);
  61. mySerial.println("object dected ALERT!");
  62. mySerial.print("\r");
  63. delay(1000);
  64. mySerial.println((char) 26);
  65. mySerial.println();
  66. delay(5000);
  67. digitalWrite(siren, HIGH);
  68. delay(20000);
  69. digitalWrite(siren, LOW);
  70. delay(1800000);
  71. }
  72. }
  73. void checkPIR()
  74. {
  75. if (digitalRead(PIR) == HIGH)
  76. {
  77. count = count + 1;
  78. }
  79. }
  80. void clearPIR()
  81. {
  82. if (count >= 2) {} else
  83. {
  84. count = 0;
  85. }
  86. }
Explanation
  • In this article I explained about security of the system.
  • It can work or function in the sensor.
  • The sensor can be used to monitor the object of a person.
  • It can locate the object and sends SMS to mobile. It also raises an alarm.
  • It will function under the GSM Module.
Output
Figure 3: Output