Arduino Security System

Ultrasonic security system

Arduino security alarm system

DEVMO 5A Range AC and DC Current Sensor Module ACS712 Module Highly Sensitive Humidity High Efficient Compatible with Ar-duino 5A

AC Current Measurement with ACS712 Sensor Module and Arduino

A fun and Simple Arduino Beginner Tutorial: Laser Alarm Security [external source]

Arduino Alarm Clock with some Easter Eggs

Arduino Security and Alarm System Project