ESP32 Trick

ESP32 boards are incredibly versatile and can be used for a wide variety of purposes in smart homes. They are small, relatively cheap, and can communicate with Bluetooth devices.

Using ESP32 as a Bluetooth Proxy

One of the simplest ways to use an ESP32 is as a Bluetooth proxy. The ESP32 can communicate with Bluetooth devices that are nearby and relay information back and forth to Home Assistant.

This means that even if your Home Assistant server is on the other side of your home, it can still communicate with Bluetooth devices, despite being a long way out of Bluetooth range.

Tracking Bluetooth Devices

Using an integration such as Bermuda, Bluetooth proxies around your home can each report back the signal strength of a detected device such as a smartphone or smartwatch.

By comparing these signal strengths, the integration can estimate which room a device is in, giving you presence detection on a room-to-room level.

Hiding ESP32 Boards

The problem with placing ESP32 boards all around your house is that they're not the most stylish-looking devices. They're often essentially bare circuit boards with a chip, a couple of LEDs, and a USB port for connecting them to power.

A clever trick is to hide them away in USB chargers, making them discreet Bluetooth presence detection sensors.

Benefits of Multiple Bluetooth Proxies

Using a single Bluetooth proxy isn't ideal. To get the most accurate results, you need multiple Bluetooth proxies around your home so that the signal strength from each can be compared to determine which Bluetooth proxy the device is likely to be nearest to.

ESP32 Board Options

There are many ESP32 board options available, including the Seeed Studio XIAO ESP32-C3, which is a budget-friendly microcontroller for smart home projects.

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