The Smart Alarm System is an embedded security solution designed to detect suspicious activity and notify the user in real time. The system monitors motion and ambient light levels using dedicated sensors and activates visual and sound alarms whenever suspicious events are detected, especially during nighttime conditions.

The main purpose of the project is to provide a simple, low-cost and efficient security system that can be used in homes, offices or restricted areas. In addition to local alarms, the device also supports Bluetooth communication, allowing users to monitor alerts and retrieve system logs remotely from a smartphone.

The initial idea behind the project was to develop a practical embedded system capable of detecting and reporting suspicious events in real time, in order to enhance security and improve response time in potentially dangerous situations.

The project can provide significant value in everyday environments where safety and continuous monitoring are essential, offering an accessible and efficient solution for improving security in homes, offices and other restricted areas.

The core of the system is a microcontroller that acquires data from sensors, processes it, and controls the output devices. When motion is detected in a low-light environment (for example, at night), the system considers the event as an intrusion attempt and activates visual and sound alarms.

The system also includes a Bluetooth module that allows the user to communicate with the device from a smartphone. Through simple commands (e.g., GETLOG), the user can retrieve logs and monitor the system status remotely.

The project is designed to be low-cost, reliable and easily extensible, making it suitable for home security, offices or restricted areas.

• ATmega328P microcontroller
• PIR motion sensor
• Light sensor (LDR)
• Buzzer controlled through PWM
• Status LEDs
• Bluetooth module
• Power supply module