PIR Sensor Based Security Alarm System

Project Description

In this project, we will discuss Home Security Alarm Using PIR Sensor & Arduino for Night time only.
A night security light only turns on when it’s dark and when movement is detected. The LED & the buzzer turns on when it’s dark & movement is detected. When there’s light, the LED is turned off, even when motion is detected.

Pin Connection

Connect sensor GND pin to GND

Connect sensor Out pin to Arduino pin 2

Connect led +ve pin to Arduino pin 5 and GND pin to GND

Connect buzzer +ve pin to Arduino pin 6 and GND pin to GND

Connect resistor one terminal to buzzer -ve terminal and another to LDR

Connect LDR one terminal to resistor and another to VCC

Circuit Diagram

Package Include

1. Arduino UNO Board
2. Uno cable
3. PIR Sensor HC-SR501
4. LDR
5. 10K Resistor
6. LED
7. Buzzer
8. 9V Battery
9. Battery snapper connector
10. Jumper Wires
11. Breadboard