An outdoor motion detector light can save electricity and scare off intruders. But if passing cars or the neighbor's dog ...

Outdoor light motion sensors can add a healthy level of security to your home. Here's how to set them up.

[ladyada] has a freshly-published and amazingly thorough tutorial on passive infrared (PIR) motion sensors. Most often seen in security floodlights and automatic doors, in creative hands these sens… ...

Unlike infrared optical sensors that use an LED transmitter and IR receiver, the PIR emits nothing. As its “passive” name suggests, it responds only to infrared energy radiated by the object ...

A look at the benefits and drawbacks of Aqara's new P2 motion sensor that works with Matter and HomeKit for automations.