Introduction
This project demonstrates how to build a DIY motion detection security system using an Arduino microcontroller and a Passive Infrared (PIR) motion sensor paired with a buzzer. The system is designed to detect human or animal movement in a monitored area and trigger an immediate audible alert.
Connections
The hardware setup requires straightforward wiring between the PIR sensor, buzzer, and the Arduino board:
- PIR Sensor VCC: Connects to the Arduino’s 5V pin.
- PIR Sensor GND: Connects to GND.
- PIR Sensor OUT: Connects to a digital input pin on the Arduino (e.g., Digital Pin 2).
- Buzzer Positive (+): Connects to a designated digital output pin on the Arduino (e.g., Digital Pin 8).
- Buzzer Negative (-): Connects to GND.
- Button switch connected to D3 and GND
- LED connected to D8 And GND
Working
The project operates through continuous environmental monitoring and microcontroller logic:
- Infrared Detection: The PIR sensor scans for changes in infrared radiation levels within its field of view, which typically happen when a person or warm-blooded animal moves across the sensor’s range.
- Signal Transmission: When motion is detected, the PIR sensor sends a high digital signal output to the Arduino input pin.
- Microcontroller Processing: The Arduino continuously monitors the PIR sensor’s output state. Upon receiving the high signal, it executes programmed logic to activate the output pin connected to the buzzer.
- Alarm Trigger: The buzzer sounds an alert to signal that movement has been detected in the protected zone, and resets once the motion ceases or the sensor’s trigger delay expires.
Components
PIR Sensor – https://link.amazon/B003C9qrN
Jumper wires – https://link.amazon/B0bWtsAH1
Arduino Nano –https://link.amazon/B09hPoigI
Small Buzzer-https://link.amazon/B08RoUHnt
Big Buzzer – https://link.amazon/B0e3VMg3j
Arduino Code – Click here