Implementation of Security Alarm using Arduino with P.I.R Motion Sensor and GSM Module

A security alarm or detection system is precisely a system by which one or something is sheltered through a system of interworking devices and components called the internet of things (IoT). When a user activates the system, the Arduino microcontroller will read the data when the PIR sensor detects an intruder. The Arduino Uno Microcontroller activates the buzzer and sends a signal to the LCD Showing the intruding. The GSM modem gets the information from the Microcontroller it will send a short message service to the designated Mobile number registered in the system. To communicate between the Mobile phone and GSM modem, AT command is applied to this research. This is because the GSM modem can only understand AT command declaration. From this, it can communicate with Mobile phones, computers, and Arduino microcontrollers. To accomplish this project, the whole component must work effectively. The GSM modem acts as a medium to receive the instructions from the microcontroller and Sends a message to the designated mobile number