The Home Assistant Connect Aux-2 is a $69, card-sized hub intended to bring older and otherwise disconnected devices into a Home Assistant smart home. It combines Wi-Fi, Bluetooth, Ethernet, USB ports, an audio jack, a sensor-accessory port, and serial connections. Using ESPHome and existing Home Assistant integrations, it can act as a Bluetooth bridge, host a Zigbee or Z-Wave antenna, control equipment over serial, and send music to powered speakers or an amplifier. Its appeal is not unique capabilities - DIY ESP32 boards and other products can do similar jobs - but a ready-made device designed to make them easier to use.
In testing, setup through a browser and Home Assistant’s guided interface proved straightforward. Bluetooth proxying connected Govee temperature sensors in a garage fridge reliably through walls and the appliance, reviving a useful alert system. The audio feature also worked after configuring Music Assistant and an amplifier, allowing music to play through previously unused in-wall speakers; the full setup took under half an hour. Grouping speakers through the still-developing Sendspin standard and making the Aux-2 an AirPlay or Spotify Connect target remained unresolved. Serial control, potentially useful for TVs, receivers, and solar inverters, was not tested. The broader case for the device is that accessible hardware can help people overcome the time and setup barriers that keep open, customizable smart-home tools unused.
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