When you have one automation watching multiple switches, you don’t need to hardcode which one to turn off. You can use the trigger object to dynamically target whichever device started the automation.

Willow provides sub-second local voice control for Home Assistant without sending your audio data to the cloud. By using an ESP32-S3 Box, you can build a private smart speaker that matches the responsiveness of commercial assistants while keeping every spoken word inside your own network. This guide walks through the full setup: hardware selection, server deployment, firmware flashing, pipeline configuration, and the fixes for the most common problems.

Cloud security camera fees have quietly become one of the priciest bills in the smart home. At $10 to $30 per camera each month, a full setup runs $500 to $1,000 a year. You pay that to have your own footage handled on someone else’s servers. Frigate NVR changes the math. Paired with a Google Coral TPU , it runs real-time AI person and object detection across many 4K streams. Inference times stay in the single-digit milliseconds. It all runs on hardware you own, on a network that never phones home.

A DIY air quality monitor built on an ESP32 and a modern particle sensor is one of the best home automation projects you can finish in a single afternoon. Wire a PMS5003 or the newer Sensirion SEN66 to an ESP32 and flash ESPHome . Within minutes, Home Assistant finds the device on your local network. No cloud account, no monthly fee, no privacy worries.

Why Monitor Air Quality at Home?

Most people think of air pollution as an outdoor problem. In fact, indoor air is often worse. Cooking on a gas stove, burning candles, running a laser printer, using sprays, or even new furniture off-gassing formaldehyde can push indoor pollutants well above outdoor levels for hours.

The average American household spends about $1,500 a year on electricity. Most of that money walks out the door with no clear sense of where. Your utility’s smart meter can tell you how many kilowatt-hours you used yesterday. It won’t tell you that your old gaming console quietly pulls 30W while it sits “off.” It won’t tell you that your water heater runs each morning right when grid prices peak. Home Assistant fixes that. Pair the right hardware with the built-in Energy Dashboard, and you get per-device, per-circuit visibility that changes how you use power.

A DIY smart mirror uses a two-way mirror panel, a monitor, and a Raspberry Pi running MagicMirror² . Behind the glass, the monitor shows widgets that seem to float in the reflection. Link it to Home Assistant and it turns from a novelty into a useful home panel. You see which lights are on, if the front door is locked, and your next calendar event.

Materials and Hardware Shopping List

Getting the parts right before you cut or mount saves a lot of pain. Two pieces shape the final build: the mirror and the monitor.