Always under-watering or over-watering your plants? Wire up this Arduino-based sensor and save them.

In the cases below, you can purchase a completed sensor and connect it to at least one major smart home hub: SmartThings, Google Home, Apple Homekit, Amazon Alexa or Home Assistant.

So CNET's Associate Technical Editor Steve Conaway and I decided to build a flood sensor that could cover a whole room, and we figured out you can do it for under five bucks.

A leak sensor is a quick and affordable way to identify potentially damaging water leaks.