It’s a fairly simple project, too: just hook an Arduino Uno up to a motion sensor and an electronic switch called a relay, then plug in your fan, and you’re good to go.

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

Amazon Echo’s built-in ultrasonic motion sensing can let you easily automate lights and fans with Alexa routines, without buying anything else.