Here is an ultra simple Arduino Night Alarm project wired around a handful of inexpensive and easily available components. One advantage of using Arduino as a security system is the flexibility!

TK has combined a PIR with an Arduino to create a smart safety light for the house or workshop. Follow along as this gets built out into a more extensive project.

This breadboard compatible package combines an ESP32-S2 module with a top-mounted PIR sensor, making it a turn key solution for all sorts of motion sensing projects.

Present consists of just a PIR sensor and Arduino in a 3D printed enclosure to snap onto your monitor.

Zigbee is a protocol that has been around for quite a long time, and you can purchase many cheap smart sensors to incorporate ...

As far as motion-sensing features are concerned, this light bulb uses the PIR infrared sensor to make sure any motion is detected.

Aritech AP750-ID is a passive infrared detector with 15.2 m detection range. This PIR motion sensor features adaptive signal processing that analyses size, speed, shape and adaptive alarm threshold.

The Aqara Presence Sensor FP2 is the most versatile of the motion/presence sensors that Aqara has to offer, thanks to its powerful hardware and sophisticated software design.

After a successful beta test, Alarm.com this week announced the general availability of its Image Sensor—a wireless device that combines a motion detector with a built-in still camera.