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This detailed project overview covers how to build a security sensor system using the Arduino UNO R4 Wifi

Project Overview
This project creates a motion-activated security alarm. When the sensor detects movement, the Arduino R4 triggers a visual alert on its built-in LED matrix and sounds an audible alarm through a buzzer.

Components Needed:
Arduino UNO R4 (WiFi or Minima)

PIR Motion Sensor (HC-SR501)

Active Piezo Buzzer

Breadboard and Jumper Wires

USB-C Cable (for programming the R4)

Wiring Instructions
PIR Sensor:

VCC to Arduino 5V

GND to Arduino GND

OUT to Arduino Digital Pin 2

Buzzer:

Positive (+) to Arduino Digital Pin 8

Negative (-) to Arduino GND

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