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💡 Smart Night Security System
💡 Smart Night Security System
In a world where safety matters, this project presents a simple yet smart solution for night-time security.
The idea is based on combining two sensors: a light sensor (LDR) and an ultrasonic sensor. The system becomes active only in the dark, making it energy-efficient and practical for real-life use.
When the environment is dark and an object gets too close, the system immediately reacts:
A buzzer produces an alert sound
LED lights turn on as a warning signal
A message is sent via Bluetooth to a mobile application indicating a possible intrusion
However, during daylight, the system remains inactive, avoiding unnecessary alerts.
This project demonstrates how smart systems can be built using simple components, combining logic, sensors, and wireless communication to create an effective and intelligent security solution.
🚀 It is a perfect example of how technology can turn basic ideas into powerful real-world applications.
🔌 Components Used
🔌 Components Used
Arduino Uno
Ultrasonic Sensor (HC-SR04)
Bluetooth Module (HC-05)
LED
Light Sensor (LDR)
Buzzer
Resistors (10kΩ & 220Ω)
website
website
This is the website I used to design the mobile application, and here is its link.
THE CIRCUIT
THE CIRCUIT
I didn’t include the HC-05 because it’s unfortunately not available on Tinkercad, so we’ll write its connections here..
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🔌Connecting the circuit in real life
VID_20260413_035223.mp4And this is the video showing the result of the connection.
📱 then the application:
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